新托福tpo阅读文本？The sinking选项不知所云,好像有语法错误,不知道是不是我的TPO版本问题,但即使这个选项语法没问题,说的也应该是第五段的细节,或者是干脆没说,所以不选。A number of issues选项对应原文第六段,正确。那么，新托福tpo阅读文本？一起来了解一下吧。

tpo阅读真题文本pdf

为了帮助大家备考托福阅读，提高成绩，下面我给大家带来托福阅读TPO24(试题+答案+译文)第2篇:Breathing During Sleep，希望大家喜欢!

托福阅读原文

【1】Of all the physiological differences in human sleep compared with wakefulness that have been discovered in the last decade, changes in respiratory control are most dramatic. Not only are there differences in the level of the functioning of respiratory systems, there are even changes in how they function. Movements of the rib cage for breathing are reduced during sleep, making the contractions of the diaphragm more important. Yet because of the physics of lying down, the stomach applies weight against the diaphragm and makes it more difficult for the diaphragm to do its job. However, there are many other changes that affect respiration when asleep.

【2】During wakefulness, breathing is controlled by two interacting systems. The first is an automatic, metabolic system whose control is centered in the brain stem. It subconsciously adjusts breathing rate and depth in order to regulate the levels of carbon dioxide (CO2) and oxygen (O2), and the acid-base ratio in the blood. The second system is the voluntary, behavioral system. Its control center is based in the forebrain, and it regulates breathing for use in speech, singing, sighing, and so on. It is capable of ignoring or overriding the automatic, metabolic system and produces an irregular pattern of breathing.

【3】During NREM (the phase of sleep in which there is no rapid eye movement) breathing becomes deeper and more regular, but there is also a decrease in the breathing rate, resulting in less air being exchanged overall. This occurs because during NREM sleep the automatic, metabolic system has exclusive control over breathing and the body uses less oxygen and produces less carbon dioxide. Also, during sleep the automatic metabolic system is less responsive to carbon dioxide levels and oxygen levels in the blood. Two things result from these changes in breathing control that occur during sleep. First, there may be a brief cessation or reduction of breathing when falling asleep as the sleeper waxes and wanes between sleep and wakefulness and their differing control mechanisms. Second, once sleep is fully obtained, there is an increase of carbon dioxide and a decrease of oxygen in the blood that persists during NREM.

【4】But that is not all that changes. During all phases of sleep, several changes in the air passages have been observed. It takes twice as much effort to breathe during sleep because of greater resistance to airflow in the airways and changes in the efficiency of the muscles used for breathing. Some of the muscles that help keep the upper airway open when breathing tend to become more relaxed during sleep, especially during REM (the phase of sleep in which there is rapid eye movement). Without this muscular action, inhaling is like sucking air out of a balloon—the narrow passages tend to collapse. Also there is a regular cycle of change in resistance between the two sides of the nose. If something blocks the "good" side, such as congestion from allergies or a cold, then resistance increases dramatically. Coupled with these factors is the loss of the complex interactions among the muscles that can change the route of airflow from nose to mouth.

【5】Other respiratory regulating mechanisms apparently cease functioning during sleep. For example, during wakefulness there is an immediate, automatic, adaptive increase in breathing effort when inhaling is made more difficult (such as breathing through a restrictive face mask). This reflexive adjustment is totally absent during NREM sleep. Only after several inadequate breaths under such conditions, resulting in the considerable elevation of carbon dioxide and reduction of oxygen in the blood, is breathing effort adjusted. Finally, the coughing reflex in reaction to irritants in the airway produces not a cough during sleep but a cessation of breathing. If the irritation is severe enough, a sleeping person will arouse, clear the airway, then resume breathing and likely return to sleep.

【6】Additional breathing changes occur during REM sleep that are even more dramatic than the changes that occur during NREM. The amount of air exchanged is even lower in REM than NREM because, although breathing is more rapid in REM,it is also more irregular, with brief episodes of shallow breathing or absence of breathing. In addition, breathing during REM depends much more on the action of the diaphragm and much less on rib cage action.

托福阅读试题

1.According to paragraph 1, which of the following can be inferred about the diaphragm during sleep?

A.During sleep the diaphragm requires increased movement of the rib cage.

B.The diaphragm helps with breathing as movements of the rib cage decrease during sleep.

C.The diaphragm requires a great amount of pressure to function properly.

D.The diaphragm contributes to the effective functioning of the rib cage.

2.According to paragraph 2, all of the following are true of the voluntary breathing system EXCEPT:

A.It has its control center in the brain stem.

B.It controls breathing for a number of activities during wakefulness.

C.It is able to bypass the automatic system.

D.It produces an irregular breathing pattern.

3.The word exclusive in the passage (paragraph 3) is closest in meaning to

A.consistent

B.perfect

C.partial

D.sole

4.According to paragraph 3, which of the following may occur just before NREM sleep begins?

A.The automatic, metabolic system may increase its dependence on air exchanges.

B.Breathing can stop for a short time as a person falls asleep.

C.An increase in the oxygen level in the blood can occur as sleep becomes fully obtained.

D.The level of carbon dioxide in the blood may drop suddenly.

5.What is the author's purpose in stating that inhaling is like sucking air out of a balloon?(in paragraph 4)

A.To refute the argument that additional effort is necessary for breathing during sleep.

B.To argue that REM sleep is more important than NREM sleep.

C.To illustrate the difficulty of breathing during sleep.

D.To illustrate how blockage of narrow passages can be prevented during sleep.

6.All of the following are mentioned in paragraph 4 as being characteristic of breathing during sleep EXCEPT

A.relaxation of the muscles involved in the respiratory system.

B.changes in resistance between the two sides of the nose.

C.easier airflow in the passages of the upper airway.

D.absence of certain complex muscle interactions.

7.According to paragraph 5, what happens during NREM sleep when inhaling is difficult?

A.There is an immediate, automatic, adaptive increase in breathing effort.

B.The sleeping person takes several inadequate breaths before the breathing effort is adjusted.

C.The coughing reflex causes the breathing effort to adjust.

D.The airways become cleared as the blood removes irritants.

8.It can be inferred from paragraph 5 that a very mild irritation during sleep will likely cause the sleeping person to

A.increase the breathing effort.

B.wake up and remove the source of irritation.

C.cough while still sleeping.

D.stop breathing temporarily while still sleeping.

9.The word considerable (paragraph 5)meaning to

A.significant.

B.Steady.

C.Usual.

D.necessary.

10.The word resume in the passage (paragraph 5) is closest in meaning to

A.reduce.

B.stop.

C.readjust.

D.restart.

11.Which of the sentences below best expresses the essential information in the highlighted sentence in the passage (paragraph 6)? Incorrect choices change the meaning in important ways or leave out essential information.

A.Because breathing is more shallow and irregular in REM than in NREM, less air is exchanged in REM.

B.Breathing in NREM is less effective than breathing in REM because of irregular episodes of rapid breathing during NREM.

C.Because breathing is more rapid in NREM sleep than in REM sleep, breathing often becomes shallow.

D.Although REM has brief episodes of shallow breathing or lack of breathing, breathing is more rapid than in NREM.

12. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? Click on a square to add the sentence to the passage. To better understand breathing during sleep, it is, however, helpful to first understand how respiration works in general.

paragraph1: Of all the physiological differences in human sleep compared with wakefulness that have been discovered in the last decade, changes in respiratory control are most dramatic. Not only are there differences in the level of the functioning of respiratory systems, there are even changes in how they function. Movements of the rib cage for breathing are reduced during sleep, making the contractions of the diaphragm more important. [■]【A】 Yet because of the physics of lying down, the stomach applies weight against the diaphragm and makes it more difficult for the diaphragm to do its job. [■]【B】 However, there are many other changes that affect respiration when asleep.

paragraph2: [■]【C】 During wakefulness, breathing is controlled by two interacting systems. [■]【D】The first is an automatic, metabolic system whose control is centered in the brain stem. It subconsciously adjusts breathing rate and depth in order to regulate the levels of carbon dioxide (CO2) and oxygen (O2), and the acid-base ratio in the blood. The second system is the voluntary, behavioral system. Its control center is based in the forebrain, and it regulates breathing for use in speech, singing, sighing, and so on. It is capable of ignoring or overriding the automatic, metabolic system and produces an irregular pattern of breathing.

13.Directions: From the seven statements below, select the statements that correctly characterize breathing during wakefulness and those statements that correctly characterize breathing during sleep. Drag each answer choice you select into the appropriate box of the table. Two of the answer choices will NOT be used. This question is worth 3 points.

A.The role of the rib cage increases and the role of the diaphragm decreases.

B.Carbon dioxide in blood rises and oxygen drops.

C.The coughing reflex is extremely complex.

D.A great deal of effort is used for breathing.

E.Upper airways are resistant to colds and allergies.

F.There is a drop in the volume of air that is exchanged.

G.Automatic and voluntary respiratory systems are both involved.

1 )

Wakefulne

A B C D E F G

2 )

Sleep

A B C D E F G

托福阅读答案

1.以diaphragm做关键词定位至第三句和第四句，说ribcage运动变少，使得diaphragm更重要，但stomach的压力使得diaphragm工作起来更困难，B是正确答案。

tpo托福口语

为了帮助大家备考托福阅读，提高成绩，下面我给大家带来托福阅读TPO21(试题+答案+译文)第一篇:Geothermal Energy，希望大家喜欢！

托福阅读原文

【1】Earth's internal heat, fueled by radioactivity, provides the energy for plate tectonics and continental drift, mountain building, and earthquakes. It can also be harnessed to drive electric generators and heat homes. Geothermal energy becomes available in a practical form when underground heat is transferred by water that is heated as it passes through a subsurface region of hot rocks (a heat reservoir) that may be hundreds or thousands of feet deep. The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface. The water is brought to the surface, as a liquid or steam, through holes drilled for the purpose.

【2】By far the most abundant form of geothermal energy occurs at the relatively low temperatures of 80° to 180° centigrade. Water circulated through heat reservoirs in this temperature range is able to extract enough heat to warm residential, commercial, and industrial spaces. More than 20,000 apartments in France are now heated by warm underground water drawn from a heat reservoir in a geologic structure near Paris called the Paris Basin. Iceland sits on a volcanic structure known as the Mid-Atlantic Ridge. Reykjavik, the capital of Iceland, is entirely heated by geothermal energy derived from volcanic heat.

【3】Geothermal reservoirs with temperatures above 180° centigrade are useful for generating electricity. They occur primarily in regions of recent volcanic activity as hot, dry rock; natural hot water; or natural steam. The latter two sources are limited to those few areas where surface water seeps down through underground faults or fractures to reach deep rocks heated by the recent activity of molten rock material. The world's largest supply of natural steam occurs at The Geysers, 120 kilometers north of San Francisco, California. In the 1990s enough electricity to meet about half the needs of San Francisco was being generated there. This facility was then in its third decade of production and was beginning to show signs of decline, perhaps because of over development. By the late 1990s some 70 geothermal electric-generating plants were in operation in California, Utah, Nevada, and Hawaii, generating enough power to supply about a million people. Eighteen countries now generate electricity using geothermal heat.

【4】Extracting heat from very hot, dry rocks presents a more difficult problem: the rocks must be fractured to permit the circulation of water, and the water must be provided artificially. The rocks are fractured by water pumped down at very high pressures. Experiments are under way to develop technologies for exploiting this resource.

【5】Like most other energy sources, geothermal energy presents some environmental problems. The surface of the ground can sink if hot groundwater is withdrawn without being replaced. In addition, water heated geothermally can contain salts and toxic materials dissolved from the hot rock. These waters present a disposal problem if they are not returned to the ground from which they were removed.

【6】The contribution of geothermal energy to the world's energy future is difficult to estimate. Geothermal energy is in a sense not renewable, because in most cases the heat would be drawn out of a reservoir much more rapidly than it would be replaced by the very slow geological processes by which heat flows through solid rock into a heat reservoir. However, in many places (for example, California, Hawaii, the Philippines, Japan, Mexico, the rift valleys of Africa)the resource is potentially so large that its future will depend on the economics of production. At present, we can make efficient use of only naturally occurring hot water or steam deposits. Although the potential is enormous, it is likely that in the near future geothermal energy can make important local contributions only where the resource is close to the user and the economics are favorable, as they are in California, New Zealand, and Iceland. Geothermal energy probably will not make large-scale contributions to the world energy budget until well into the twenty-first century, if ever.

托福阅读试题

1.According to the processes described in paragraph 1, what is the relationship between radioactivity and the steam produced by geothermal heat?

A.Geothermally heated steam is produced when water is exposed to radioactivity deep underground.

B.When water is introduced into holes drilled thousands of feet in the ground, it becomes radioactive and turns to steam.

C.Radioactivity heats Earth's interior rock, which in turn can heat water to the point it becomes steam.

D.When a reservoir of steam in subsurface rock is produced by radioactivity, it is said to be geothermally heated.

2.The word "practical" in paragraph 1 is closest in meaning to

A.usable.

B.plentiful.

C.economical.

D.familiar.

3.The word "abundant" in paragraph 2 is closest in meaning to

A.economical.

B.familiar.

C.plentiful.

D.useful.

4.According to paragraph 2, which of the following is true about heat reservoirs with a temperature in the range of 80°to 180° centigrade?

A.They are under international control.

B.They are more common than reservoirs that have a higher temperature.

C.Few of them produce enough heat to warm large industrial spaces.

D.They are used to generate electricity.

5.According to paragraph 3, what is the connection between underground faults and naturally occurring steam?

A.Underground faults enable the heat from molten-rock material to escape upward to regions where it can heat surface water enough to produce steam.

B.Underground faults are created by steam that is produced in geothermal reservoirs deep inside Earth.

C.Underground faults create spaces in which natural steam is sometimes trapped.

D.Underground faults allow surface water to reach deep rocks that are hot enough to turn it into steam.

6.In paragraph 3, why does the author mention that in the 1990s The Geysers was in its third decade of production?

A.To provide the historical context of the geothermal production of electricity in the United States.

B.To imply that The Geysers was the first geothermal site to be put into production in California.

C.To help explain the signs of decline shown by The Geysers.

D.To explain why 70 new geothermal sites were put into electricity production in the late 1990s.

7.Which of the following can be inferred from paragraphs 2 and 3 about geothermal reservoirs?

A.Volcanic heat is associated only with geothermal reservoirs that have a temperature over 180° centigrade.

B.More countries produce power from geothermal reservoirs than use them for heating buildings.

C.Most geothermal reservoirs are suitable for producing electricity.

D.A higher geothermal reservoir temperature is needed to generate electricity than is needed to heat homes.

8.According to paragraph 4, extracting heat from very hot, dry rocks is difficult in part because

A.the underground rock must be fractured before heat can be removed from it.

B.the water above the rock is under very high pressure.

C.the rock breaks apart when water is pumped into it.

D.the water circulated through the rock must be much cooler than the rock itself.

9.The word "exploiting" in paragraph 4 is closest in meaning to

A.locating.

B.increasing.

C.making use of.

D.estimating the size of.

10.How is the problem that the surface may sink related to the problem that water heated geothermally may contain toxic materials?

A.Both problems could be solved by returning groundwater that is removed from an underground heat reservoir back to the reservoir after heat is extracted from it.

B.The problem of sinking is more difficult to solve than is the problem of toxic materials.

C.Land at the surface sinks because the rock beneath the surface is weakened when salts and toxic materials are removed from it in the process of extracting geothermal energy.

D.Both problems are caused by the fact that the hot groundwater in a heat reservoir dissolves the rock, which weakens the rock and makes the water toxic with salt.

11.Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 6? Incorrect choices change the meaning in important ways or leave out essential information.

A.Heat flows through solid rock very slowly, so it takes a very long time for geological processes to produce a reservoir of geothermal energy.

B.Geothermal energy is not renewable because heat flows very slowly through solid rock into or out of a heat reservoir.

C.The heat quickly removed from a heat reservoir is replaced so slowly by geological processes that geothermal energy is not practically speaking, renewable.

D.In most cases, heat travels into a heat reservoir so slowfy that it is a much quicker process to remove the heat from a reservoir than to replace it.

12.In paragraph 6, the author implies that in California, Hawaii, the Philippines, Japan, Mexico, and the rift valleys of Africa the potential size of the geothermal resource is so large that

A.it might be economically worth developing these sites even though geothermal energy is not renewable.

B.these sites will be the first geothermal energy sites to be developed with new technology.

C.these sites are likely to make a large-scale contribution to the world energy budget in the twenty-first century.

D.it does not matter whether they have naturally occurring deposits of hot water or steam.

13. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? Click on a square to add the sentence to the passage. In either case, the heated water will usually be under considerable pressure, and so may have a temperature that is well above its sea-level boiling point of 100° centigrade.

Earth's internal heat, fueled by radioactivity, provides the energy for plate tectonics and continental drift, mountain building, and earthquakes. It can also be harnessed to drive electric generators and heat homes. Geothermal energy becomes available in a practical form when underground heat is transferred by water that is heated as it passes through a subsurface region of hot rocks (a heat reservoir) that may be hundreds or thousands of feet deep. ■【A】The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface. ■【B】The water is brought to the surface, as a liquid or steam, through holes drilled for the purpose.■【C】

By far the most abundant form of geothermal energy occurs at the relatively low temperatures of 80° to 180° centigrade. ■【D】Water circulated through heat reservoirs in this temperature range is able to extract enough heat to warm residential, commercial, and industrial spaces. More than 20,000 apartments in France are now heated by warm underground water drawn from a heat reservoir in a geologic structure near Paris called the Paris Basin. Iceland sits on a volcanic structure known as the Mid-Atlantic Ridge. Reykjavik, the capital of Iceland, is entirely heated by geothermal energy derived from volcanic heat.

14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

Heat reservoirs in the form of hot rock far beneath Earth's surface are a potential source of usable geothermal energy.

A.Heat reservoirs with a temperature from 80° to 180° centigrade can be used, as in France and Iceland, to heat buildings.

B.A number of countries now use geothermal reservoirs that contain water or steam above 180° centigrade to generate electricity.

C.Most heat reservoirs with a temperature above 180° centigrade cannot be used for energy because they are usually too close to recent volcanic activity.

D.The sinking of land above heat reservoirs and other environmental problems arise when water is pumped into a heat reservoir under high pressure.

E.Experiments are under way to determine if geothermally heated waters could be used as a source of certain minerals that have been dissolved out of hot rocks deep within Earth.

F.A number of issues, including how to extract heat from reservoirs that do not have a natural supply of water, will significantly limit the use of geothermal energy for the foreseeable future.

托福阅读答案

1.细节题，问radioactivity和steam的关系，所以找双关键词，分别定位至本段第一句和最后一句，第一句说radioactivity提供了地球的内热，最后一句说水变成蒸汽到达地表，水受热才能蒸汽，而这份热量是geothermal energy提供的，这就是二者的关系，所以答案是C。

tpo149阅读文本

Listen to part of a lecture in a business class.

People who are likely to buy a company’s product are called target customers and

these target customers influence a company’s marketing strategy. In order to develop a

marketing strategy, a company would look at certain characteristics of target

customers to decide when and where to advertise, so that they’ll reach the target

customers most effectively. I’d like to talk to you today about two characteristics of

target customers that can influence marketing strategy, specifically age and

geographic location of target customers.

Say a company makes toy cars, who are its target customers? Kids, right? So if a

company wants to make sure its television advertising reaches its target customers,

it’d want to advertise during times when kids are actually watching television, like

during children’s television shows. That way it can make sure that kids see the

advertisements and that way the company will get people in that age group to go buy

toy cars or to ask their parents to buy them, at least.

Now, another important characteristic to consider is geographic location, places where

the company’s target customers live. Think about a company that makes boats. Its

target customers are people who own homes near oceans or lakes, places where they

can use boats, after all, people who don’t live near water don’t have much use for

boats. So by placing advertisement on signs along the road or on television in cities

and towns that are near oceans or lakes, the company would be more likely to reach

the target customers for its boats and sell more of them as a result.

Using points and examples from the lecture, explain how the characteristics of target

customers influence marketing strategy for products.

采纳我呀~~

托福tpo62

相信备考托福的同学都知道托福TPO的重要性，为了方便大家备考，下面我给大家整理出托福TPO1阅读真题原文及答案翻译，希望大家喜欢。

托福TPO1阅读真题原文Part3

Timberline Vegetation on Mountains

The transition from forest to treeless tundra on a mountain slope is often a dramatic one. Within a vertical distance of just a few tens of meters, trees disappear as a life-form and are replaced by low shrubs, herbs, and grasses. This rapid zone of transition is called the upper timberline or tree line. In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.

The upper timberline, like the snow line, is highest in the tropics and lowest in the Polar Regions. It ranges from sea level in the Polar Regions to 4,500 meters in the dry subtropics and 3,500-4,500 meters in the moist tropics. Timberline trees are normally evergreens, suggesting that these have some advantage over deciduous trees (those that lose their leaves) in the extreme environments of the upper timberline. There are some areas, however, where broadleaf deciduous trees form the timberline. Species of birch, for example, may occur at the timberline in parts of the Himalayas.

At the upper timberline the trees begin to become twisted and deformed. This is particularly true for trees in the middle and upper latitudes, which tend to attain greater heights on ridges, whereas in the tropics the trees reach their greater heights in the valleys. This is because middle- and upper- latitude timberlines are strongly influenced by the duration and depth of the snow cover. As the snow is deeper and lasts longer in the valleys, trees tend to attain greater heights on the ridges, even though they are more exposed to high-velocity winds and poor, thin soils there. In the tropics, the valleys appear to be more favorable because they are less prone to dry out, they have less frost, and they have deeper soils.

There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline. Various environmental factors may play a role. Too much snow, for example, can smother trees, and avalanches and snow creep can damage or destroy them. Late-lying snow reduces the effective growing season to the point where seedlings cannot establish themselves. Wind velocity also increases with altitude and may cause serious stress for trees, as is made evident by the deformed shapes at high altitudes. Some scientists have proposed that the presence of increasing levels of ultraviolet light with elevation may play a role, while browsing and grazing animals like the ibex may be another contributing factor. Probably the most important environmental factor is temperature, for if the growing season is too short and temperatures are too low, tree shoots and buds cannot mature sufficiently to survive the winter months.

Above the tree line there is a zone that is generally called alpine tundra. Immediately adjacent to the timberline, the tundra consists of a fairly complete cover of low-lying shrubs, herbs, and grasses, while higher up the number and diversity of species decrease until there is much bare ground with occasional mosses and lichens and some prostrate cushion plants. Some plants can even survive in favorable microhabitats above the snow line. The highest plants in the world occur at around 6,100 meters on Makalu in the Himalayas. At this great height, rocks, warmed by the sun, melt small snowdrifts.

The most striking characteristic of the plants of the alpine zone is their low growth form. This enables them to avoid the worst rigors of high winds and permits them to make use of the higher temperatures immediately adjacent to the ground surface. In an area where low temperatures are limiting to life, the importance of the additional heat near the surface is crucial. The low growth form can also permit the plants to take advantage of the insulation provided by a winter snow cover. In the equatorial mountains the low growth form is less prevalent.

Paragraph 1: The transition from forest to treeless tundra on a mountain slope is often adramatic one. Within a vertical distance of just a few tens of meters, trees disappear as a life-form and are replaced by low shrubs, herbs, and grasses. This rapid zone of transition is called the upper timberline or tree line. In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.

托福TPO1阅读真题题目Part3

1. The word "dramatic" in the passage is closest in meaning to

○gradual

○complex

○visible

○striking

2. Where is the lower timberline mentioned in paragraph 1 likely to be found?

○In an area that has little water

○In an area that has little sunlight

○Above a transition area

○On a mountain that has on upper timberline.

3. Which of the following can be inferred from paragraph 1 about both the upper and lower timberlines?

○Both are treeless zones.

○Both mark forest boundaries.

○Both are surrounded by desert areas.

○Both suffer from a lack of moisture.

Paragraph 2: The upper timberline, like the snow line, is highest in the tropics and lowest in the Polar Regions. It ranges from sea level in the Polar Regions to 4,500 meters in the dry subtropics and 3,500-4,500 meters in the moist tropics. Timberline trees are normally evergreens, suggesting that these have some advantage over deciduous trees (those that lose their leaves) in the extreme environments of the upper timberline. There are some areas, however, where broadleaf deciduous trees form the timberline. Species of birch, for example, may occur at the timberline in parts of the Himalayas.

4. Paragraph 2 supports which of the following statements about deciduous trees?

○They cannot grow in cold climates.

○They do not exist at the upper timberline.

○They are less likely than evergreens to survive at the upper timberline.

○They do not require as much moisture as evergreens do.

Paragraph 3: At the upper timberline the trees begin to become twisted and deformed. This is particularly true for trees in the middle and upper latitudes, which tend to attain greater heights on ridges, whereas in the tropics the trees reach their greater heights in the valleys. This is because middle- and upper- latitude timberlines are strongly influenced by the duration and depth of the snow cover. As the snow is deeper and lasts longer in the valleys, trees tend to attain greater heights on the ridges, even though they are more exposed to high-velocity winds and poor, thin soils there. In the tropics, the valleys appear to be more favorable because they are less prone to dry out, they have less frost, and they have deeper soils.

5. The word "attain" in the passage is closest in meaning to

○require

○resist

○achieve

○endure

6. The word "they" in the passage refers to

○valleys

○trees

○heights

○ridges

7. The word "prone" in the passage is closest in meaning to

○adapted

○likely

○difficult

○resistant

8. According to paragraph 3, which of the following is true of trees in the middle and upper latitudes?

○Tree growth is negatively affected by the snow cover in valleys

○Tree growth is greater in valleys than on ridges.

○Tree growth on ridges is not affected by high-velocity winds.

○Tree growth lasts longer in those latitudes than it does in the tropics.

Paragraph 4：There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline. Various environmental factors may play a role. Too much snow, for example, can smother trees, and avalanches and snow creep can damage or destroy them. Late-lying snow reduces the effective growing season to the point where seedlings cannot establish themselves. Wind velocity also increases with altitude and may cause serious stress for trees, as is made evident by the deformed shapes at high altitudes. Some scientists have proposed that the presence of increasing levels of ultraviolet light with elevation may play a role, while browsing and grazing animals like the ibex may be another contributing factor. Probably the most important environmental factor is temperature, for if the growing season is too short and temperatures are too low, tree shoots and buds cannot mature sufficiently to survive the winter months.

9. Which of the sentences below best express the essential information in the highlighted sentence in the passage? In correct choices change the meaning in important ways or leave out essential information.

○Because of their deformed shapes at high altitudes, trees are not likely to be seriously harmed by the strong winds typical of those altitudes.

○As altitude increases, the velocity of winds increase, leading to a serious decrease in the number of trees found at high altitudes.

○The deformed shapes of trees at high altitudes show that wind velocity, which increase with altitude, can cause serious hardship for trees.

○Increased wind velocity at high altitudes deforms the shapes of trees, and this may cause serious stress for trees.

10. In paragraph 4, what is the author's main purpose in the discussion of the dramatic cessation of tree growth at the upper timberline?

○To argue that none of several environment factors that are believed to contribute to that phenomenon do in fact play a role in causing it.

○To argue in support of one particular explanation of that phenomenon against several competing explanations

○To explain why the primary environmental factor responsible for that phenomenon has not yet been identified

○To present several environmental factors that may contribute to a satisfactory explanation of that phenomenon

Paragraph 6: The most striking characteristic of the plants of the alpine zone is their low growth form. This enables them to avoid the worst rigors of high winds and permits them to make use of the higher temperatures immediately adjacent to the ground surface. In an area where low temperatures are limiting to life, the importance of the additional heat near the surface is crucial. The low growth form can also permit the plants to take advantage of the insulation provided by a winter snow cover. In the equatorial mountains the low growth form is lessprevalent.

11. The word "prevalent" in the passage is closest in meaning to

○predictable

○widespread

○successful

○developed

12. According to paragraph 6, all of the following statements are true of plants in the alpine zone EXCEPT:

○Because they are low, they are less exposed to strong winds.

○Because they are low, the winter snow cover gives them more protection from the extreme cold.

○In the equatorial mountains, they tend to be lower than in mountains elsewhere.

○Their low growth form keeps them closer to the ground, where there is more heat than further up.

Paragraph 5: Above the tree line there is a zone that is generally called alpine tundra. █Immediately adjacent to the timberline, the tundra consists of a fairly complete cover of low-lying shrubs, herbs, and grasses, while higher up the number and diversity of species decrease until there is much bare ground with occasional mosses and lichens and some prostrate cushion plants. █Some plants can even survive in favorable microhabitats above the snow line. The highest plants in the world occur at around 6,100 meters on Makalu in the Himalayas. █At this great height, rocks, warmed by the sun, melt small snowdrifts. █

13. Look at the four squares [█] that indicate where the following sentence could be added to the passage.

This explains how, for example, alpine cushion plants have been found growing at an altitude of 6,180 meters.

Where would the sentence best fit?

14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

At the timberline, whether upper or lower, there is a profound change in the growth of trees and other plants.

●

●

●

Answer choices

○Birch is one of the few species of tree that can survive in the extreme environments of the upper timberline.

○There is no agreement among scientists as to exactly why plant growth is sharply different above and below the upper timberline.

○The temperature at the upper timberline is probably more important in preventing tree growth than factors such as the amount of snowfall or the force of winds.

○The geographical location of an upper timberline has an impact on both the types of trees found there and their physical characteristics.

○High levels of ultraviolet light most likely play a greater role in determining tree growth at the upper timberline than do grazing animals such as the ibex.

○Despite being adjacent to the timberline, the alpine tundra is an area where certain kinds of low trees can endure high winds and very low temperatures

托福TPO1阅读真题答案Part3

答案：

1. ○4

2. ○1

3. ○2

4. ○3

5. ○3

6. ○2

7. ○2

8. ○1

9. ○3

10. ○4

11. ○2

12. ○3

13. ○4

14. There is no agreement among…

Despite being adjacent …

The geographical location of…

托福TPO1阅读真题Part3原文翻译

山上树带界线的植被

通常从山坡上的森林到没有树的苔原是一种非常戏剧化的转变。

托福阅读真题100篇pdf

TPO是我们常用的托福模考工具，对我们的备考很有价值，下面我给大家带来托福阅读TPO16(试题+答案+译文)第1篇:Trade and the Ancient Middle East。

托福阅读原文

Trade was the mainstay of the urban economy in the Middle East, as caravans negotiated the surrounding desert, restricted only by access to water and by mountain ranges. This has been so since ancient times, partly due to the geology of the area, which is mostly limestone and sandstone, with few deposits of metallic ore and other useful materials Ancient demands for obsidian (a black volcanic rock useful for making mirrors and tools) led to trade with Armenia to the north, while jade for cutting tools was brought from Turkistan, and the precious stone lapis lazuli was imported from Afghanistan. One can trace such expeditions back to ancient Sumeria, the earliest known Middle Eastern civilization. Records show merchant caravans and trading posts set up by the Sumerians in the surrounding mountains and deserts of Persia and Arabia, where they traded grain for raw materials, such as timber and stones, as well as for metals and gems.

Reliance on trade had several important consequences. Production was generally in the hands of skilled individual artisans doing piecework under the tutelage of a master who was also the shop owner. In these shops differences of rank were blurred as artisans and masters labored side by side in the same modest establishment, were usually members of the same guild and religious sect, lived in the same neighborhoods, and often had assumed (or real) kinship relationships. The worker was bound to the master by a mutual contract that either one could repudiate, and the relationship was conceptualized as one of partnership.

This mode of craft production favored the growth of self-governing and ideologically egalitarian craft guilds everywhere in the Middle Eastern city. These were essentially professional associations that provided for the mutual aid and protection of their members, and allowed for the maintenance of professional standards. The growth of independent guilds was furthered by the fact that surplus was not a result of domestic craft production but resulted primarily from international trading; the government left working people to govern themselves, much as shepherds of tribal confederacies were left alone by their leaders. In the multiplicity of small-scale local egalitarian or quasi-egalitarian organizations for fellowship, worship, and production that flourished in this laissez-faire environment, individuals could interact with one another within a community of harmony and ideological equality, following their own popularly elected leaders and governing themselves by shared consensus while minimizing distinctions of wealth and power.

The mercantile economy was also characterized by a peculiar moral stance that is typical of people who live by trade—an attitude that is individualistic, calculating, risk taking, and adaptive to circumstances. As among tribespeople, personal relationships and a careful weighing of character have always been crucial in a mercantile economy with little regulation, where one's word is one's bond and where informal ties of trust cement together an international trade network. Nor have merchants and artisans ever had much tolerance for aristocratic professions of moral superiority, favoring instead an egalitarian ethic of the open market, where steady hard work, the loyalty of one's fellows, and ntrepreneurial skill make all the difference. And, like the pastoralists, Middle Eastern merchants and artisans unhappy with their environment could simply pack up and leave for greener pastures—an act of self-assertion wholly impossible in most other civilizations throughout history.

Dependence on long-distance trade also meant that the great empires of the Middle East were built both literally and figuratively on shifting sand. The central state, though often very rich and very populous, was intrinsically fragile, since the development of new international trade routes could undermine the monetary base and erode state power, as occurred when European seafarers circumvented Middle Eastern merchants after Vasco da Gama's voyage around Africa in the late fifteenth century opened up a southern route. The ecology of the region also permitted armed predators to prowl the surrounding barrens, which were almost impossible for a state to control. Peripheral peoples therefore had a great advantage in their dealings with the center, making government authority insecure and anxious.

托福阅读试题

1.According to paragraph 1, why has trade been so important throughout the history of the Middle East

A.The rare and valuable metals and stones found in Middle Eastern deserts have always been in high demand in surrounding areas.

B.Growing conditions throughout the Middle East are generally poor, forcing Middle Eastern people to depend on imported grain.

C.Many useful and decorative raw materials cannot be found naturally in the Middle East but are available from neighboring regions.

D.Frequent travel, due to limited water supplies in the Middle East, created many opportunities for trade with neighboring societies.

2.The word “repudiate” in the passage (paragraph 2) is closest in meaning to

A.respect

B.reject

C.review

D.revise

3.According to paragraph 2, how did Middle Eastern shop owners treat their workers?

A.Workers were ranked according to their skill level, with the most-experienced artisans becoming partial owners of the shop.

B.Shop owners treated different workers differently depending on how much the workers had in common with their masters.

C.Workers were bound to their masters by unbreakable contracts that strictly defined the terms of their partnership.

D.The shop owner worked alongside the workers and often considered them partner and members of the family.

4.The author includes the information that surplus was not a result of domestic craft production but resulted primarily from international trading (in passage 3) in order to

A.support the claim that the mode of production made possible by the craft guilds w very good for trade

B.contrast the economic base of the city government with that of the tribal confederacies

C.provide a reason why the government allowed the guilds to be self-controlled

D.suggest that the government was missing out on a valuable opportunity to tax the guilds

5.According to paragraph 3, all of the following are true of the Middle Eastern craft guilds EXCEPT:

A.The guilds were created to support workers and to uphold principles of high-quality craft production.

B.Each guild was very large and included members from a broad geographic area.

C.The leaders of the guilds were chosen by popular vote.

D.All guild members were treated as equals.

6.The word “consensus” in the passage (paragraph 3) is closest in meaning to

A.authority

B.responsibility

C.custom

D.agreement

7.According to paragraph 4, which of the following was NOT necessary for success in themercantile economy?

A.Good business sense

B.Reliable associates

C.Family wealth

D.Constant effort

8.Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 4? Incorrect choices change the meaning in important ways or leave out essential information.

A.Tribes people were comfortable forming personal relationships with merchants, who, like them, were bound by their promises to one another.

B.Because trade was not formally regulated, merchants were careful about whom they trusted and often conducted business with people they knew personally.

C.While trade among merchants relied somewhat on regulation, among tribes people trade was based on personal relationships and careful character evaluation.

D.Because tribes people were bound only by their promises to one another, personal relationships were formed only after careful weighing of character.

9.The word “ethic” in the passage (paragraph 4) is closest in meaning to

A.set of moral principles

B.division of labor

C.economic system

D.test of character

10.According to paragraph 4, what choice did Middle Eastern merchants and artisans have that many other people have not had?

A.If they were unhappy in the mercantile environment, they could draw on personal connections to find a different kind of work.

B.They were allowed to assert their opinions without having to listen to aristocratic professions of moral superiority.

C.Following the example of the pastoralists, they could demand, and receive, better working conditions.

D.If they didn't like their environment, they could move somewhere else.

11.The word “intrinsically” in the passage (paragraph 5) is closest in meaning to

A.fundamentally

B.surprisingly

C.consequently

D.particularly

12.In paragraph 5, why does the author mention the new trade route opened up by Vasco da Gama's fifteenth century voyage around Africa?

A.To provide evidence that European seafarers took every opportunity to bypass Middle Eastern merchants

B.To present an instance in which Middle Eastern states lost money and power because of their reliance on long-distance trade

C.To argue this new route became necessary when European seafarers wanted to avoid Middle Eastern states whose central power had begun to erode

D.To explain how da Gama helped European traders avoid the dangerous predators prowling the areas surrounding Middle Eastern cities

13. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? For one thing, it created a demand for finished goods to be sold both locally and abroad.

Paragraph2: Reliance on trade had several important consequences. ■【A】Production was generally in the hands of skilled individual artisans doing piecework under the tutelage of a master who was also the shop owner. ■【B】In these shops differences of rank were blurred as artisans and masters labored side by side in the same modest establishment, were usually members of the same guild and religious sect, lived in the same neighborhoods, and often had assumed (or real) kinship relationships. ■【C】The worker was bound to the master by a mutual contract that either one could repudiate, and the relationship was conceptualized as one of partnership. ■【D】

14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

Since ancient times. reliance on trade has shaped the culture and organizational structure of Middle Eastern societies.

A.Persian and Arabian merchants traveled great distances to sell their finished goods at the marketplaces of ancient Sumeria.

B.Revenue from trade was unevenly distributed, causing Middle Eastern societies to be characterized by growing distinctions in wealth and power.

C.Qualities that were valued in the mercantile economy included individualism, hard work, loyalty, and the willingness to take risks.

D.As production increased, centralized control over production also increased, leading in turn to more-centralized control over fellowship and worship.

E.Crafts were produced by skilled artisans working in close, egalitarian relationships with their masters and other fellow guild members.

F.The stability of Middle Eastern governments was threatened by their lack of control over international trade patterns and over their own peripheral territories.

托福阅读答案

1.问trade为什么主要，这段第一句就说是mainstay，第二句就给出了原因，说他们没有这个没有那个，所以答案是C。

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