托福阅读真题练习100篇：05（原文+题目+答案） 托福阅读TPO26(试题+答案+译文)第1篇:EnergyandtheIndustrialRevolution

今天蜕变培训网小编整理了托福阅读真题练习100篇：05（原文+题目+答案） 托福阅读TPO26(试题+答案+译文)第1篇:EnergyandtheIndustrialRevolution相关信息，希望在这方面能够更好的大家。

本文目录一览：

• 1、托福阅读真题练习100篇：05（原文+题目+答案）
• 2、托福阅读TPO26(试题+答案+译文)第1篇:EnergyandtheIndustrialRevolution
• 3、托福TPO3阅读真题原文及答案翻译Part3

托福阅读真题练习100篇：05（原文+题目+答案）

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原文：
​​Perhaps the most obvious way artistic creation reflects how people live is by mirroring theenvironment — the materials and technologies available to a culture. Stone, wood, tree bark, clay,and sand are generally available materials. In addition, depending on the locality, other resourcesmay be accessible: shells, horns, gold, copper, and silver. The different uses to which societies putthese materials are of interest to anthropologists who may ask, for example, why people chooseto use clay and not copper when both items are available. Although there are no conclusiveanswers yet, the way in which a society views its environment is sometimes apparent in its choiceand use of artistic materials. The use of certain metals, for example, may be reserved forceremonial objects of special importance. Or the belief in the supernatural powers of a stone ortree may cause a sculptor to be sensitive to that material.
What is particularly meaningful to anthropologist is the realization that although thematerials available to a society may to some extent limit or influence what it can do artistically,the materials by no means determine what is done. Why do the artists in Japanese society rakesand into patterns; and the artists in Roman society melt sand to form glass? Moreover, evenwhen the same material is used in the same way by members of different societies, the form orstyle of the work varies enormously from culture to culture. A society may simply choose torepresent objects or phenomena that are important to its population. An examination of the artof the Middle Ages tells us something about the medieval preoccupation with theologicaldoctrine. In addition to revealing the primary concerns of a society, the content of that society'sart may also reflect the culture's social stratification.
题目：
1. According to the passage , gold, copper, and silver are
(A) more difficult to handle than wood and
(B) of their stable social conditions
(C) of the unique stylistic features of their art
(D) available only in specific locations
2. The word conclusive in line 7 is closest in meaning to
(A) definitive
(B) controversial
(C) concurrent
(D) realistic
3. The word apparent in line 8 is closest in meaning to
(A) attractive
(B) logical
(C) evident
(D) distinct
4. Why does the author mention the supernatural powers of a stone or tree in line 10?
(A) to show that some sculptors avoid working with specific materials
(B) to emphasize the unusual properties of certain materials
(C) as an example of how art can be influenced by cultural beliefs
(D) as an illustration of the impact of the environment on religious beliefs
5. The word it in line 13 refers to
(A) realization
(B) society
(C) extent
(D) influence
6. It can be inferred that the author mentions the Japanese and Roman societies because
(A) they influenced each other stone
(B) commonly used by artists in all societies
(C) essential to create ceremonial objects
(D) they used the same artistic material in very different ways
7. According to the passage , all of the following statements about sand are true EXCEPT
(A) It is used to create glass.
(B) Roman artists mix it into their paints.
(C) Its use varies from culture to culture.
(D) Japanese artists use it to create artistic patterns.
8. The word Moreover in line 16 is closest in meaning to
(A) similarly
(B) in addition
(C) in contrast
(D) frequently
9. The word preoccupation in line 20 is closest in meaning to
(A) involvement
(B) separation
(C) relationship
(D) argument
10. The word primary in line 21 is closest in meaning to
(A) discrete
(B) preliminary
(C) ideal
(D) fundamental
答案：

​DACCB DBBAD
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托福阅读TPO26(试题+答案+译文)第1篇:EnergyandtheIndustrialRevolution

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TPO26(试题+答案+译文)第1篇:Energy and the Industrial Revolution，希望大家喜欢!

托福阅读原文

【1】For years historians have sought to identify crucial elements in the eighteenth-century rise in industry, technology, and economic power known as the Industrial Revolution, and many give prominence to the problem of energy. Until the eighteenth century, people relied on energy derived from plants as well as animal and human muscle to provide power. Increased efficiency in the use of water and wind helped with such tasks as pumping, milling, or sailing. However, by the eighteenth century, Great Britain in particular was experiencing an energy shortage. Wood, the primary source of heat for homes and industries and also used in the iron industry as processed charcoal, was diminishing in supply. Great Britain had large amounts of coal; however, there were not yet efficient means by which to produce mechanical energy or to power machinery. This was to occur with progress in the development of the steam engine.

【2】In the late 1700s James Watt designed an efficient and commercially viable steam engine that was soon applied to a variety of industrial uses as it became cheaper to use. The engine helped solve the problem of draining coal mines of groundwater and increased the production of coal needed to power steam engines elsewhere. A rotary engine attached to the steam engine enabled shafts to be turned and machines to be driven, resulting in mills using steam power to spin and weave cotton. Since the steam engine was fired by coal, the large mills did not need to be located by rivers, as had mills that used water- driven machines. The shift to increased mechanization in cotton production is apparent in the import of raw cotton and the sale of cotton goods. Between 1760 and 1850, the amount of raw cotton imported increased 230 times. Production of British cotton goods increased sixtyfold, and cotton cloth became Great Britain’s most important product, accounting for one-half of all exports. The success of the steam engine resulted in increased demands for coal, and the consequent increase in coal production was made possible as the steam-powered pumps drained water from the ever-deeper coal seams found below the water table.

【3】The availability of steam power and the demands for new machines facilitated the transformation of the iron industry. Charcoal, made from wood and thus in limited supply, was replaced with coal-derived coke (substance left after coal is heated) as steam-driven bellows came into use for producing of raw iron. Impurities were burnt away with the use of coke, producing a high-quality refined iron. Reduced cost was also instrumental in developing steam-powered rolling mills capable of producing finished iron of various shapes and sizes. The resulting boom in the iron industry expanded the annual iron output by more than 170 times between 1740 and 1840, and by the 1850s Great Britain was producing more tons of iron than the rest of the world combined. The developments in the iron industry were in part a response to the demand for more machines and the ever-widening use of higher-quality iron in other industries.

【4】Steam power and iron combined to revolutionize transport, which in turn had further implications. Improvements in road construction and sailing had occurred, but shipping heavy freight over land remained expensive, even with the use of rivers and canals wherever possible. Parallel rails had long been used in mining operations to move bigger loads, but horses were still the primary source of power. However, the arrival of the steam engine initiated a complete transformation in rail transportation, entrenching and expanding the Industrial Revolution. As transportation improved, distant and larger markets within the nation could be reached, thereby encouraging the development of larger factories to keep pace with increasing sales. Greater productivity and rising demands provided entrepreneurs with profits that could be reinvested to take advantage of new technologies to further expand capacity, or to seek alternative investment opportunities. Also, the availability of jobs in railway construction attracted many rural laborers accustomed to seasonal and temporary employment. When the work was completed, many moved to other construction jobs or to factory work in cities and towns, where they became part of an expanding working class.

托福阅读试题

1.Why does the author provide the information that “Great Britain had large amounts of coal”(paragraph 1)?

A.To reject the claim that Britain was facing an energy shortage in the eighteenth century.

B.To explain why coal rather than other energy resources became the primary source of heat for homes and industries in eighteenth-century Britain.

C.To indicate that Britain’s energy shortage was not the result of a lack of fuel.

D.To explain why coal mining became an important industry in nineteenth-century.

2.What was “the problem of energy" that had to be solved to make the Industrial Revolution of the eighteenth century possible?

A.Water and wind could not be used efficiently.

B.There was no efficient way to power machinery.

C.Steam engines required large amounts of coal, which was in short supply.

D.Neither humans nor animals were strong enough to provide the power required for industrial application.

3.Which of the following is NOT mentionedin paragraph 2 as a development in cotton mills brought about by Watt’s steamengine?

A.The importing of huge quantities of raw cotton by Britain.

B.Increased mechanization.

C.More possibilities for mill location.

D.Smaller mills.

4.The phrase “apparent in” in the passage(paragraph 2)is closest in meaning to

A.clearly seen in.

B.aided by.

C.associated with.

D.followed by.

5.According to paragraph 2, what was Britain’s most important export by 1850?

A.Raw cotton.

B.Cotton cloth.

C.Steam-powered pumps.

D.Coal.

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

A.resulting.

B.encouraging.

C.well documented.

D.immediate.

7.What is the role of paragraph 2 in the passage as a whole?

A.It explains how by increasing the supply of raw materials from other countries, British industries were able to reduce costs and increase production.

B.It explains how the production of mechanical energy and its benefits spread quickly across countries that were linked commercially with Great Britain.

C.It demonstrates why developments in a single industry could not have caused the Industrial Revolution.

D.It illustrates why historians have assigned great importance to the issue of energy in the rise of the Industrial Revolution.

8.According to paragraph 3, why was the use of coke important for the ironindustry?

A.It helped make wood into charcoal.

B.It reduced the dependency on steam-powered machines used for the production of iron.

C.It replaced charcoal in the production of raw and refined iron.

D.It powered the machines used to extract coal in coal mines.

9.According to paragraph 3, all of the following were true of the ironindustry in Great Britain during the 1800s EXCEPT

A.Steam-driven bellows were used to produce raw iron.

B.By the 1850s Britain was the world’s largest producer of iron.

C.Steam-powered mills made it possible to produce iron of different shapes and sizes.

D.Greater demand for higher-quality iron increased its price.

10.The word “initiated”in the passage is closest in meaning to

A.anticipated.

B.accelerated.

C.spread.

D.started.

11.Paragraph 4 implies which of the following about the transformation inrail transportation?

A.Because railway construction employed mostly rural laborers, unemployment increased among urban workers.

B.It resulted in more trade within the country, but less trade with markets that could be reached only by ocean shipping.

C.It made shipping freight overland to distant markets less expensive.

D.It resulted in higher wages for factory workers.

12.The phrase “accustomed to" in the passage is closest in meaning to

A.in need of.

B.used to.

C.tired of.

D.encouraged by.

13. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Click on a square to add the sentence to the passage. The first steam-powered locomotives were slow but they rapidly improved in speed and carrying capacity.

Steam power and iron combined to revolutionize transport, which in turnhad further implications. Improvements in road construction and sailing had occurred, but shipping heavy freight over land remained expensive, even with the use of rivers and canals wherever possible. Parallel rails had long been used in mining operations to move bigger loads, but horses were still the primary source of power. ■【A】However, the arrival of the steam engine initiated a complete transformation in rail transportation, entrenching and expanding the Industrial Revolution. ■【B】As transportation improved, distant and larger markets within the nation could be reached, thereby encouraging the development of larger factories to keep pace with increasing sales. ■【C】Greater productivity and rising demands provided entrepreneurs with profits that could be reinvested to take advantage of new technologies to further expand capacity, or to seek alternative investment opportunities. ■【D】Also, the availability of jobs in railway construction attracted many rural laborers accustomed to seasonal and temporary employment. When the work was completed,many moved to other construction jobs or to factory work in cities and towns, where they became part of an expanding working class.

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.

The coming of the Industrial Revolution in eighteenth-century Britaindepended on the development of the steam engine to power machinery.

A.For years, historians disregarded the issue of energy as a major element in the rise of the Industrial Revolution and focused instead on technological developments and increased production.

B.The introduction and growth of steam-powered rail transport was a major factor in Britain's economic expansion during the Industrial Revolution.

C.An expansion of the Industrial Revolution outside Great Britain occurred when British industries began to import raw cotton and high-quality iron.

D.By 1850, the use of steam power in Britain's mills, mines, and iron industry made Britain a world leader in the production of cotton cloth and iron.

E.Since the basic infrastructure was in place, the Industrial Revolution fueled itself with enlarging markets requiring ever more expansion of factories and workforce.

F.By the end of the 1800s, railway construction attracted so many laborers that factories could not find enough workers to keep up with increasing sales.

托福 阅读答案

1.目的题，读highlight所在句，说英国有煤，但没法变成能量来运行机器，选项C同时说了由煤木有能量，是正确答案。A错在不是reject，原文承认缺能量，A说反;B错在原文没讲other energy resources怎么样;D错在coal mining变成重要行业没讲。

2.以the problem of energy做关键词定位至第二句，但这句话没有内容，于是往后看，下一句讲依靠动植物和人作为能量的来源，看完这句话最大的可能是选D，但原文没说动植物和人的能源不够，所以D不对。排除法，A说风和水能没有有效利用，而原文第四句说越来越多的使用，所以A错;C跟上一题相反，错;B跟上一题相同，正确。

3.A的huge quantity of raw cotton定位至倒数第三句，说进口增加了230倍，正确，不选;B定位至第五句，说机械化越来越多，正确，不选;C的mill location定位至第四句，说mill不用在水边了，也就是C说的更多可能的位置，正确，不选;也同样在这句话里说大的mills，跟D说的相反，所以D错，选。

4.apparent in明显，所以正确答案是A的clearly seen in。词根是pare，意思是可见，想想透明transparent和appear。代入，原文讲转向不断增加的mechanization是什么样的通过进口raw cotton，紧接着后面就用数字讲进口cotton怎么怎么样，说明很显著。B帮忙和C相关明显不通。前后两句没有明显的先后关系，所以follow不通。

5.以most important export和1850做关键词定位至倒数第二句和倒数第三句，说raw cotton进口增加了230倍，cotton cloth变成了最重要的产品，占了出口的一半，所以正确答案是B的cotton cloth。注意A的raw cotton是进口的。

6.consequent结果的，所以正确答案是resulting。之前有讲蒸汽机的成功result in了煤炭需求的增加，和consequent煤炭生产的增加，需求增加当然导致生产增加，所以正确答案是A，C和D完全不对，A和B相比A更好。

7.问整段的，看首尾。首句讲1700年代瓦特发明了蒸汽机，随着越来越便宜，应用越来越广;尾句说steam engine的成功导致煤炭需求和生产的增加。MS没有正确答案，可采用排除法，首先没讲除英国之外的其他国家，所以A和B都不对，C说一个行业不能引起工业革命，原文也没讲。D正确的原因是煤炭的应用解决了能源问题，正确，不记得的话看看第一段的末尾。

8.以coke做关键词定位至第二句，讲在制铁的过程中，coke替代了charcoal，但没讲coke能干嘛，所以往下看，说impurity随着coke的使用被烧掉了，也就是除杂质，所以正确答案是C，B和D的machine没讲;A说把木头变成charcoal，原文也没说。

9.A的steam-driven bellows定位至第二句，正确，不选;B的1850s和Britain定位至第五句，说英国的产量等于其他国家产量之和，当然是最大生产国，所以B正确，不选;C的different shapes and sizes定位至第四句，正确，不选;D的price没讲，错，选。

10.initiated开始，所以正确答案是D。代入，说steam engine的到来怎么了铁路运输的彻底改变，能说得通的只有B和D。因为之前没有说到变化，所以不是加速，开始了一种全新的变化更好些。

11.以transformation in rail transportation做关键词定位至第四句和第五句，说随着transportation改善，能到达更远更大的国内市场，导致更大的销量和更大的工厂，所以正确答案是C。A的rural laborers，B的ocean shipping和D的wage原文都没有有说。

12.accustomed to习惯，所以正确答案是B，used to意思完全一样。不认识的同学看custom，风俗习惯，前面的ac前缀和后面的ed均没有实际意义。代入，说铁路建设提供的工作机会吸引了工人，这些工人是怎么样季节性迁徙的，C厌倦和D鼓励说不通。A需要和B习惯就要看词汇量了。

13.此题名词过渡不容易找，只能找到动词improve，所以正确答案非B即C。B之后有as transportation improved，也就是给出improve之后的结果，应该是先有improve后有结果，所以正确答案是B。

14.For years选项与首段第二句相反，错。The introduction选项对应最后一段，正确。An expansion选项中的outside Great Britain怎么样原文没讲，错。By 1850选项对应原文第二段和第三段，正确。Since the basic选项对应原文最后一段后半部分，正确。By the end选项中的工厂找不到工人跟上increasing sales没说，错。

托福阅读译文

【1】多年来，历史学家试图找到18世纪工业革命在工业、技术和经济领域兴起的关键因素，许多人把能源问题放在突出位置。直到18世纪，人们依靠工厂、畜力以及人力来提供动力。高效地利用水能和风能有助于完成诸如抽泵、碾磨或航海等工作。然而，到了18世纪，尤其是大不列颠却经历了能源短缺。木材，这一为家庭和工业供暖供能,同时也以加工木炭的形式被使用在钢铁工业中的主要能源，其供应量日益减少。大不列颠有大

量的煤矿;然而，还没有产生机械能或为机器提供动力的有效 方法 。这一切随着蒸汽机的改良而发生。

【2】在18世纪末期，詹姆斯?瓦特设计了一款高效且具商业利益的蒸汽机，由于其价格低廉，很快就被运用到各项工业生产之中。这款蒸汽机帮助解决了煤矿中地下水的排水问题并且提高了煤的产量，这些煤用来为别处的蒸汽机提供动力。与蒸汽机相连的旋转式发动机带动轴承转动，从而驱动机器，运用蒸汽动力纺织棉布的纺织厂随之出现。因为蒸汽机靠燃煤而驱动，一些大型棉纺织厂就不再像那些使用水力驱动机器的工厂一样必须依河而建。这种棉纺织业日益机械化的转变在棉花原料的进口和棉纺产品的销售中得到突出的体现。在1760年到1850年间，原棉的进口量增长了230倍。英国棉纺产品的生产量增加了60倍，而棉布则成了英国最重要的产品，占出口总额的一半。蒸汽机的成功带来了对煤需求量的增加，而且随着蒸汽动力泵从位于地下水位下的更深的煤层中排出水来，随之而来的煤产量的增加成为可能。

【3】蒸汽动力的可利用性以及对新机器的需求促进了钢铁工业的转型。当蒸汽驱动风箱投入到生铁生产中后，木炭这种用木材烧成因此供应量有限的物质就被焦炭(煤加热后残留的物质)替代了。随着焦炭的使用，生铁中的杂质被燃烧完，从而生产出更高质量的精炼铁。降低的成本也有助于那些能够生产不同形状和尺寸的成品铁制品的蒸汽动力轧钢厂的发展。因此导致的钢铁工业的繁荣使钢铁的年产量在1740年到1840年间增长了170多倍，到19世纪50年代，大不列颠生产的钢铁比世界其他地区生产的总和还要高。钢铁工业的发展从某种意义上说，是对更多机器的需求以及在其他工业中更广泛使用高质量铁的一种回应。

【4】蒸汽动力和钢铁带来了交通运输的革新，反过来也有着更加深远的影响。道路设施以及航海的改善已经初见成效，但是船运重型货物到陆地的费用仍然很高，即使在可以使用河流和运河的地方。平行铁轨长期以来被用于采矿作业来运输大型货物，但是马匹仍然是主要的动力来源。然而，蒸汽机的到来引发了铁路运输的彻底变革，巩固和扩大了工业革命的成果。随着交通运输的改善，全国范围内更远更大的市场可以到达，因此鼓励着大型工厂的生产与日益增长的销售量保持同步。更大规模的生产和日益增长的需求给企业家带来了利润，这种利润可用于再投资新技术，进一步扩大产能或寻求其他的投资机会。同时，铁道建设方面的更多就业机会也吸引了那些习惯于季节性工作或者短工制的农村劳动力。一旦工作完成，其中的很多人就会参与到其他的建筑工作中或是城镇中的工厂工作中，并成为其中的不断壮大的工人阶级。

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托福TPO作为托福的模考工具，它的题目对于我们备考托福很有参考价值，为了帮助大家备考，下面我给大家整理了托福TPO3阅读真题原文Part3，望喜欢！

托福TPO3阅读真题原文Part3

The Long-Term Stability of Ecosystems

Plant communities assemble themselves flexibly, and their particular structure depends on the specific history of the area. Ecologists use the term "succession" to refer to the changes that happen in plant communities and ecosystems over time. The first community in a succession is called a pioneer community, while the long-lived community at the end of succession is called a climax community. Pioneer and successional plant communities are said to change over periods from 1 to 500 years. These changes-in plant numbers and the mix of species-are cumulative. Climax communities themselves change but over periods of time greater than about 500 years. 蜕变培训网

An ecologist who studies a pond today may well find it relatively unchanged in a year's time. Individual fish may be replaced, but the number of fish will tend to be the same from one year to the next. We can say that the properties of an ecosystem are more stable than the individual organisms that compose the ecosystem.

At one time, ecologists believed that species diversity made ecosystems stable. They believed that the greater the diversity the more stable the ecosystem. Support for this idea came from the observation that long-lasting climax communities usually have more complex food webs and more species diversity than pioneer communities. Ecologists concluded that the apparent stability of climax ecosystems depended on their complexity. To take an extreme example, farmlands dominated by a single crop are so unstable that one year of bad weather or the invasion of a single pest can destroy the entire crop. In contrast, a complex climax community, such as a temperate forest, will tolerate considerable damage from weather to pests.

The question of ecosystem stability is complicated, however. The first problem is that ecologists do not all agree what "stability" means. Stability can be defined as simply lack of change. In that case, the climax community would be considered the most stable, since, by definition, it changes the least over time. Alternatively, stability can be defined as the speed with which an ecosystem returns to a particular form following a major disturbance, such as a fire. This kind of stability is also called resilience. In that case, climax communities would be the most fragile and the least stable, since they can require hundreds of years to return to the climax state.

Even the kind of stability defined as simple lack of change is not always associated with maximum diversity. At least in temperate zones, maximum diversity is often found in mid-successional stages, not in the climax community. Once a redwood forest matures, for example, the kinds of species and the number of individuals growing on the forest floor are reduced. In general, diversity, by itself, does not ensure stability. Mathematical models of ecosystems likewise suggest that diversity does not guarantee ecosystem stability-just the opposite, in fact. A more complicated system is, in general, more likely than a simple system to break down. A fifteen-speed racing bicycle is more likely to break down than a child's tricycle.

Ecologists are especially interested to know what factors contribute to the resilience of communities because climax communities all over the world are being severely damaged or destroyed by human activities. The destruction caused by the volcanic explosion of Mount St. Helens, in the northwestern United States, for example, pales in comparison to the destruction caused by humans. We need to know what aspects of a community are most important to the community's resistance to destruction, as well as its recovery.

Many ecologists now think that the relative long-term stability of climax communities comes not from diversity but from the "patchiness" of the environment, an environment that varies from place to place supports more kinds of organisms than an environment that is uniform. A local population that goes extinct is quickly replaced by immigrants from an adjacent community. Even if the new population is of a different species, it can approximately fill the niche vacated by the extinct population and keep the food web intact.

Paragraph 1: Plant communities assemble themselves flexibly, and their particular structure depends on the specific history of the area. Ecologists use the term "succession" to refer to the changes that happen in plant communities and ecosystems over time. The first community in a succession is called a pioneer community, while the long-lived community at the end of succession is called a climax community. Pioneer and successional plant communities are said to change over periods from 1 to 500 years. These changes-in plant numbers and the mix of species-are cumulative. Climax communities themselves change but over periods of time greater than about 500 years.

托福TPO3阅读真题题目Part3

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

○natural

○final

○specific

○complex

2. According to paragraph 1, which of the following is NOT true of climax communities?

○They occur at the end of a succession.

○They last longer than any other type of community.

○The numbers of plants in them and the mix of species do not change.

○They remain stable for at least 500 years at a time.

Paragraph 2: An ecologist who studies a pond today may well find it relatively unchanged in a year's time. Individual fish may be replaced, but the number of fish will tend to be the same from one year to the next. We can say that the properties of an ecosystem are more stable than the individual organisms that compose the ecosystem.

3. According to paragraph 2, which of the following principles of ecosystems can be learned by studying a pond?

○Ecosystem properties change more slowly than individuals in the system.

○The stability of an ecosystem tends to change as individuals are replaced.

○Individual organisms are stable from one year to the next.

○A change in the members of an organism does not affect an ecosystem's properties.

Paragraph 3: At one time, ecologists believed that species diversity made ecosystems stable. They believed that the greater the diversity the more stable the ecosystem. Support for this idea came from the observation that long-lasting climax communities usually have more complex food webs and more species diversity than pioneer communities. Ecologists concluded that the apparent stability of climax ecosystems depended on their complexity. To take an extreme example, farmlands dominated by a single crop are so unstable that one year of bad weather or the invasion of a single pest can destroy the entire crop. In contrast, a complex climax community, such as a temperate forest, will tolerate considerable damage from weather to pests.

4. According to paragraph 3, ecologists once believed that which of the following illustrated the most stable ecosystems?

○Pioneer communities

○Climax communities

○Single-crop farmlands

○Successional plant communities

Paragraph 4: The question of ecosystem stability is complicated, however. The first problem is that ecologists do not all agree what "stability" means. Stability can be defined as simply lack of change. In that case, the climax community would be considered the most stable, since, by definition, it changes the least over time. Alternatively, stability can be defined as the speed with which an ecosystem returns to a particular form following a major disturbance, such as a fire. This kind of stability is also called resilience. In that case, climax communities would be the most fragile and the least stable, since they can require hundreds of years to return to the climax state.

5. According to paragraph 4, why is the question of ecosystem stability complicated?

○The reasons for ecosystem change are not always clear.

○Ecologists often confuse the word "stability" with the word "resilience."

○The exact meaning of the word "stability" is debated by ecologists.

○There are many different answers to ecological questions.

6. According to paragraph 4, which of the following is true of climax communities?○They are more resilient than pioneer communities.

○They can be considered both the most and the least stable communities.

○They are stable because they recover quickly after major disturbances.

○They are the most resilient communities because they change the least over time.

Paragraph 5: Even the kind of stability defined as simple lack of change is not always associated with maximum diversity. At least in temperate zones, maximum diversity is often found in mid-successional stages, not in the climax community. Once a redwood forest matures, for example, the kinds of species and the number of individuals growing on the forest floor are reduced. In general, diversity, by itself, does not ensure stability. Mathematical models of ecosystems likewise suggest that diversity does not guarantee ecosystem stability-just the opposite, in fact. A more complicated system is, in general, more likely than a simple system to break down. A fifteen-speed racing bicycle is more likely to break down than a child's tricycle.

7. Which of the following can be inferred from paragraph 5 about redwood forests?

○They become less stable as they mature.

○They support many species when they reach climax.

○They are found in temperate zones.

○They have reduced diversity during mid-successional stages.

8. The word "guarantee" in the passage is closest in meaning to

○increase

○ensure

○favor

○complicate

9. In paragraph 5, why does the author provide the information that "A fifteen-speed racing bicycle is more likely to break down than a child's tricycle"?

○To illustrate a general principle about the stability of systems by using an everyday example

○To demonstrate that an understanding of stability in ecosystems can be applied to help understand stability in other situations

○To make a comparison that supports the claim that, in general, stability increases with diversity

○To provide an example that contradicts mathematical models of ecosystems

Paragraph 6: Ecologists are especially interested to know what factors contribute to the resilience of communities because climax communities all over the world are being severely damaged or destroyed by human activities. The destruction caused by the volcanic explosion of Mount St. Helens, in the northwestern United States, for example, pales in comparison to the destruction caused by humans. We need to know what aspects of a community are most important to the community's resistance to destruction, as well as its recovery.

10. The word "pales" in the passage is closest in meaning to

○increases proportionally

○differs

○loses significance

○is common

Paragraph 7: Many ecologists now think that the relative long-term stability of climax communities comes not from diversity but from the "patchiness" of the environment, an environment that varies from place to place supports more kinds of organisms than an environment that is uniform. A local population that goes extinct is quickly replaced by immigrants from an adjacentcommunity. Even if the new population is of a different species, it can approximately fill the niche vacated by the extinct population and keep the food web intact.

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

○Ecologists now think that the stability of an environment is a result of diversity rather than patchiness.

○Patchy environments that vary from place to place do not often have high species diversity.

○Uniform environments cannot be climax communities because they do not support as many types of organisms as patchy environments.

○A patchy environment is thought to increase stability because it is able to support a wide variety of organisms.

12.The word "adjacent" in the passage is closest in meaning to

○foreign

○stable

○fluid

○neighboring

Paragraph 6: █Ecologists are especially interested to know what factors contribute to the resilience of communities because climax communities all over the world are being severely damaged or destroyed by human activities. █The destruction caused by the volcanic explosion of Mount St. Helens, in the northwestern United States, for example, pales in comparison to the destruction caused by humans. █We need to know what aspects of a community are most important to the community's resistance to destruction, as well as its recovery. █

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

In fact, damage to the environment by humans is often much more severe than damage by natural events and processes.

Where would the sentence best fit? Click on a square to add the sentence to the passage.

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.

The process of succession and the stability of a climax community can change over time.

●

●

●

Answer choices

○The changes that occur in an ecosystem from the pioneer to the climax community can be seen in one human generation.

○A high degree of species diversity does not always result in a stable ecosystem.

○The level of resilience in a plant community contributes to its long-term stability.

○Ecologists agree that climax communities are the most stable types of ecosystems.

○Disagreements over the meaning of the term "stability" make it difficult to identify the most stable ecosystems.

○The resilience of climax communities makes them resistant to destruction caused by humans

托福TPO3阅读真题答案Part3

参考答案：

1. ○3

2. ○3

3. ○1

4. ○2

5. ○3

6. ○2

7. ○3

8. ○2

9. ○1

10. ○3

11. ○4

12. ○4

13. ○2

14. A high degree of species diversity

The level of resilience in

Disagreements over the

托福TPO3阅读翻译Part3

参考翻译：生态系统的长期稳定

植物群体可以自由地聚集，它们特殊的结构取决于聚集区域的具体历史。生态学家使用"演替"来诠释植物群落和生态系统随着时间推移所发生的变化。演替中的第一个群落被称作先锋群落，而处于演替最后那个长期生存的群落被称为顶极群落。先锋群落和紧接着的植物群落的变化周期是从1到500年不等，植物数量和混合种类数量的变化是慢慢积累的。顶极群落本身也改变，但其变化周期超过500年。

现代一个研究池塘的生态学会发现池塘在一年当中相对而言是不变的。个别鱼类可能被替换，但年复一年鱼的总数都趋于一致。也就是说，一个生态系统自身的属性要比由单一生物体组成的生态系统更稳定。

生态学家们一度认为物种的多样性使生态系统稳定，生态系统物种越多样则生态系统越稳定。通过观察得出的结论支持了这个观点，长期持久的顶极群落通常要比先锋群落具备更为复杂的食物网和更多的物种。生态学家家们得出的结论是：顶点生态系统的稳定性明显取决于他们的复杂化程度。举个极端的例子，在单一作物的农田中，一年的恶劣天气或单一害虫的入侵就可以摧毁所有作物。与此相反，在一个复杂的顶极群落里，如温带森林，他们便可以抵御来自气候和害虫的干扰和入侵。

不管怎样，生态系统稳定性的问题非常复杂。首先，不是所有的生态学家都赞同"稳定"的含义。稳定性可以简单地定义为缺乏变化。如果是这样的话，顶极群落将被视为最稳定的，因为根据定义，他们随着时间推移而变化得最少。另外，稳定性也可以界定为生态系统在经历了严重破坏之后回复原貌的速度，比如火灾。这种稳定性也被称作弹性。在这种情况下，顶极群落将是最脆弱和最不稳定的，因为他们可能需要数百年时间才能恢复到顶点状态。

即使是这种被定义为简单地缺乏变化的稳定性并非总是与最多样的物种联系起来。至少在温带地区，会经常在演替过程中发现最多物种，而不是在顶极群落中。例如，红杉树林一旦成熟，其中的物种数量以及单个物种的数量都会减少。一般来说，多样性本身并不能保证稳定性(事实上正相反)，生态系统的数学模型也可以得出同样的结论。一个更复杂的系统可能比一个简单的系统更容易被破坏(一个十五速的 赛车 比一个孩子的三轮车更容易损坏)。

生态学家们更想弄清楚到底哪些因素有助于促成群落的恢复，因为世界各地的顶极群落都因为人类活动而遭受到严重的损坏或毁坏。就像美国西北部圣海伦火山的猛烈喷发所造成的破坏，在人类活动对环境造成的破坏面前也相形见绌。我们必须了解对群落抵抗、破坏和恢复来说哪些是最重要的。

现在的很多生态学家们认为，顶极群落相对长期的稳定性并非来自于多样性，而是来自环境的"补缀"，随处变化的环境比始终如一的环境更有利于多种有机体的生存。当地物种灭亡后，马上就会被相邻群落的移民取代。即便是另一种不同的物种，他们也可以填补那些已灭绝生物的空缺，并保持食物网的完整。

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