1月9日托福阅读真题答案及解析(精选8篇)由网友“朱思远”投稿提供,这次小编给大家整理过的1月9日托福阅读真题答案及解析,供大家阅读参考,也相信能帮助到您。
篇1:1月9日托福阅读真题答案及解析
原文回顾: 恐龙在白垩纪灭绝是被广泛承认的,不过很多物种也是在这个时候灭绝的。恐龙灭绝还有一个原因是他繁殖太慢,有的动物比如鳄鱼就存活了下来。活下来的浮游生物大多有一种能力,不过界线两边的浮游生物化石有变化,浮游生物突然减少,而在这里另一种生物的石化增多了,而且正好在同一沉积层。他们之间可能有某些联系。
相关背景学习:Extinction
In biology and ecology, extinction is the end of an organism or of a group of organisms (taxon), normally a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly “reappears” (typically in the fossil record) after a period of apparent absence.
The age of the Earth is about 4.54 billion years old. The earliest undisputed evidence of life on Earth dates at least from 3.5 billion years ago, during the Eoarchean Era after a geological crust started to solidify following the earlier molten Hadean Eon. There are microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Earlier physical evidences of life include graphite, a biogenic substance, in 3.7 billion-year-old metasedimentary rocks discovered in southwestern Greenland, as well as, “remains of biotic life” found in 4.1 billion-year-old rocks in Western Australia. According to one of the researchers, “If life arose relatively quickly on Earth ... then it could be common in the universe.”
More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described.
Through evolution, species arise through the process of speciation—where new varieties of organisms arise and thrive when they are able to find and exploit an ecological niche—and species become extinct when they are no longer able to survive in changing conditions or against superior competition. The relationship between animals and their ecological niches has been firmly established. A typical species becomes extinct within 10 million years of its first appearance, although some species, called living fossils, survive with virtually no morphological change for hundreds of millions of years.
Mass extinctions are relatively rare events; however, isolated extinctions are quite common. Only recently have extinctions been recorded and scientists have become alarmed at the current high rate of extinctions. Most species that become extinct are never scientifically documented. Some scientists estimate that up to half of presently existing plant and animal species may become extinct by 2100.
托福词汇之态度词汇使用方法
证实:verify, prove, substantiate, corroborate, confirm
反驳:refute, disprove, controvert, contradict
支持(认可): endorse, support, encourage, reinforce, countenance, approve
反对(抗议):oppose, demur, deprecate, quibble, defy
肯定, 断言:aver, assert, affirm, proclaim
否定:deny, gainsay, repudiate, disclaim, negate
托福词汇分类之情绪感受
Modds and Feelings 情绪与感受
1.wonderful adj. 极好的
2.marvelous adj. 极棒的
3.terrific adj. 极佳的
4.fantastic adj. 太棒的
5.good adj. 好的
6.fine adj. 健康的
7.bad adj. 不好的
8.horrible adj. 糟透的
9.terrible adj. 极糟糕的
10.happy adj. 快乐开心的
11.glad adj. 高兴的
12.angry adj. 生气的
13.jealous adj. 忌妒的
14.nervous adj. 紧张的
15.lonely adj. 寂寞的
16.afraid adj. 害怕的
17.sorry adj. 难过遗憾的
18.homesick adj. 想家的
19.envy adj. 羡慕
20.unhappy adj. 悲惨不快乐的
21.sad adj. 悲伤的
篇2:1月9日托福阅读真题答案及解析
原文回顾:相似的语言来自同一种语言体系,语言在某一个时候被分化成很多支,时间越长,变化越大。不一样的地区有不一样的语言,然而一些相似的语言可能来自同一种语言体系。经过漫长的演变,各种语族的语法结构都不同。不过这不影响研究,因为真正能反应人们想法和经历的是词汇。比如词汇里二十多种有关衣服的表达,那么这说明这对他们有特殊意义,而且他们的母语都有这东西。
相关背景学习: Linguistics
篇3:托福阅读真题及答案解析
托福阅读真题练习:声音的文本+题目+答案
托福阅读文本:
A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual, and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate unsureness or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the conversant's tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and /or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication.
Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed.
托福阅读题目:
1. What does the passage mainly discuss?
(A) The function of the voice in performance
(B) The connection between voice and personality
(C) Communication styles
(D) The production of speech
2. What does the author mean by stating that, “At interpersonal levels, tone may reflect ideas and
feelings over and above the words chosen” (lines 9-10)?
(A) Feelings are expressed with different words than ideas are.
(B) The tone of voice can carry information beyond the meaning of words.
(C)A high tone of voice reflects an emotional communication.
(D) Feelings are more difficult to express than ideas.
3. The word “Here” in line 10 refers to
(A) interpersonal interactions
(B) the tone
(C) ideas and feelings
(D) words chosen
4. The word “derived” in line 15 is closest in meaning to
(A) discussed
(B) prepared
(C) registered
(D) obtained
5. Why does the author mention “artistic, political, or pedagogic communication” in line 17?
(A)As examples of public performance
(B)As examples of basic styles of communication
(C) To contrast them to singing
(D) To introduce the idea of self-image
6.According to the passage , an exuberant tone of voice, may be an indication of a person's
(A) general physical health
(B) personality
(C) ability to communicate
(D) vocal quality
7.According to the passage , an overconfident front may hide
(A) hostility
(B) shyness
(C) friendliness
(D) strength
8. The word “drastically” in line 24 is closest in meaning to
(A) frequently
(B) exactly
(C) severely
(D) easily
9. The word “evidenced” in line 25 is closest in meaning to
(A) questioned
(B) repeated
(C) indicated
(D) exaggerated
10.According to the passage , what does a constricted and harsh voice indicate?
(A) lethargy
(B) depression
(C) boredom
(D) anger
托福阅读答案:
BBADABBCCD
托福阅读真题练习:水彩画的文本+题目+答案
托福阅读文本:
The year 1850 may be considered the beginning of a new epoch in America art, with respect to the development of watercolor painting. In December of that year, a group of thirty artists gathered in the studio of John Falconer in New York City and drafted both a constitution and bylaws, establishing The Society for the Promotion of Painting in Water Color. In addition to securing an exhibition space in the Library Society building in lower Manhattan, the society founded a small school for the instruction of watercolor painting. Periodic exhibitions of the members' paintings also included works by noted English artists of the day, borrowed from embryonic private collections in the city. The society's activities also included organized sketching excursions along the Hudson River. Its major public exposure came in 1853, when the society presented works by its members in the “Industry of All Nations” section of the Crystal Palace Exposition in New York.
The society did not prosper, however, and by the time of its annual meeting in 1854 membership had fallen to twenty-one. The group gave up its quarters in the Library Society building and returned to Falconer's studio, where it broke up amid dissension. No further attempt to formally organize the growing numbers of watercolor painters in New York City was made for more than a decade. During that decade, though, Henry Warren's Painting in Water Color was published in New York City in 1856 — the book was a considerable improvement over the only other manual of instruction existing at the time, Elements of Graphic Art, by Archibald Roberson,published in 1802 and by the 1850's long out of print.
In 1866 the NationalAcademy of Design was host to an exhibition of watercolor painting in its elaborate neo-Venetian Gothic building on Twenty-Third Street in New York City. The exhibit was sponsored by an independent group called The Artists Fund Society. Within a few months of this event, forty-two prominent artists living in and near New York City founded The American Society of Painters in Water Colors.
托福阅读题目:
1. This passage is mainly about
(A) the most influential watercolor painters in the mid-1800's
(B) efforts to organize watercolor painters in New York City during the mid-1800's
(C) a famous exhibition of watercolor paintings in New York City in the mid-1800's
(D) styles of watercolor painting in New York City during the mid-1800's
2. The year 1850 was significant in the history of watercolor painting mainly because
(A) a group of artists established a watercolor painting society
(B) watercolor painting was first introduced to New York City
(C) John Falconer established his studio for watercolor painters
(D) The first book on watercolor painting was published
3. The word “securing” in line 5 is closest in meaning to
(A) locking
(B) creating
(C) constructing
(D) acquiring
4. All of the following can be inferred about the Society for the promotion of Painting in
Watercolor EXCEPT:
(A) The society exhibited paintings in lower Manhattan.
(B) Instruction in watercolor painting was offered by members of the society
(C) The society exhibited only the paintings of its members.
(D) Scenes of the Hudson River appeared often in the work of society members.
5. The exhibition at the Crystal Palace of the works of the Society for the Promotion of Painting in
Watercolor was significant for which of the following reasons?
(A) It resulted in a dramatic increase in the popularity of painting with watercolor.
(B) It was the first time an exhibition was funded by a private source.
(C) It was the first important exhibition of the society's work.
(D) It resulted in a large increase in the membership of the society.
6. The word “it” in line 15 refers to
(A) time
(B) group
(C) building
(D) studio
7. Which of the following is true of watercolor painters in New York City in the late 1850's?
(A) They increased in number despite a lack of formal organization.
(B) They were unable to exhibit their paintings because of the lack of exhibition space.
(C) The Artists Fund Society helped them to form The American Society of Painters in Water
Colors.
(D) They formed a new society because they were not allowed to join groups run by other kinds of
artists.
8. Henry Warren's Painting in Water Color was important to artists because it
(A) received an important reward
(B) was the only textbook published that taught painting
(C) was much better than an earlier published fundamental of instruction
(D) attracted the interest of art collectors
9. The word “considerable” in line 19 is closest in meaning to
(A) sensitive
(B) great
(C) thoughtful
(D) planned
10. The year 1866 was significant for watercolor painting for which of the following reasons?
(A) Elements of GraphicArt was republished.
(B) Private collections of watercolors were first publicly exhibited.
(C) The neo-Venetian Gothic building on Twenty-Third Street in New York City was built.
(D) The NationalAcademy of Design held an exhibition of watercolor paintings.
11. The word “prominent” in line 25 is closest in meaning to
(A) wealthy
(B) local
(C) famous
(D) organized
托福阅读答案:
BADCC BACBD C
托福阅读真题练习:霍霍坎的文本+题目+答案
托福阅读文本:
The observation of the skies has played a special part in the lives and cultures of peoples since the earliest of times. Evidence obtained from a site known as the Hole in the Rock, in Papago Park in Phoenix, Arizona, indicates that it might have been used as an observatory by a prehistoric people known as the Hohokam.
The physical attributes of the site allow its use as a natural calendar/clock. The “hole” at Hole in the Rock is formed by two large overhanging rocks coming together at a point, creating a shelter with an opening large enough for several persons to pass through. The northeast-facing overhang has a smaller opening in its roof. It is this smaller hole that produces the attributes that may have been used as a calendar/clock.
Because of its location in the shelter's roof, a beam of sunlight can pass through this second hole and cast a spot onto the shelter's wall and floor. This spot of light travels from west to east as the sun moves across the sky. It also moves from north to south and back again as the Earth travels around the Sun, the west-to-east movement could have been used to establish a daily clock, much like a sundial, while the north-to-south movement could have been used to establish a seasonal calendar.
The spot first appears and starts down the surface of the wall of the shelter at different times of the morning depending on the time of the year. The spot grows in size from its first appearance until its maximum size is achieved roughly at midday. It then continues its downward movement until it reaches a point where it jumps to the floor of the shelter. As the Sun continues to move to the west, the spot continues to move across the shelter floor and down the butte, or hill, toward a group of small boulders. If a person is seated on a certain one of these rocks as the spot reaches it, the Sun can be viewed through the calendar hole. This occurs at different times in the afternoon depending on the time of year.
托福阅读题目:
1. What does the passage mainly discuss?
(A) observations of the stars by ancient people
(B) rock formations of Arizona
(C) a site used by ancient people to measure time
(D) the movement of the earth around the Sun
2. The word “obtained” in line 2 is closest in meaning to
(A) acquired
(B) transported
(C) covered
(D) removed
3. The word “attributes” in line 5 is closest in meaning to
(A) changes
(B) characteristics
(C) locations
(D) dimensions
4. The word “its” in line 10 refers to
(A) roof
(B) beam
(C) hole
(D) spot
5. The word “establish” in line 15 is closest in meaning to
(A) create
(B) locate
(C) consult
(D) choose
6. Which of the following is NOT true of the spot of light?
(A) It is caused by sunlight passing through a hole.
(B) It travels across the roof of the shelter.
(C) Its movement is affected by the position of the Sun.
(D) It movement could have been used to estimate the time of day.
7. From which of the following can be the time of year be determined?
(A) The movement of the spot of light from west to east
(B) The speed with which the spot of light moves
(C) The movement of the spot of light from north to south
(D) The size of the sport of light at midday
8. The word “roughly” in line 18 is closest in meaning to
(A) finally
(B) harshly
(C) uneasily
(D) approximately
9. The passage mentions that the Hole in the Rock was used as all of the following EXCEPT
(A) a calendar
(B) a home
(C) a clock
(D) an observatory
10. Which of the following can be inferred from the fourth paragraph?
(A) The boulders are located below the rock shelter.
(B) The person seated on the rock cannot see the shelter.
(C)After it passes the boulders, the spot of light disappears.
(D) The spot of light is largest when it first appears.
托福阅读答案:
CABCA BCDBA
篇4:托福阅读真题解析
Passage Three学科分类:生物
题目:The day length and reproductive time in animal
内容回忆:
第1段提出 动物一般都会在食物充分的时候生产,如果食物不够,后代不足以生存,那动物如何判断呢。有很多的环境线索,其中最重要的是日长,日长不但影响动物繁殖和生产还影响动物的迁徙和冬眠;
第2,3段讲到这日长影响动物的理论在1900初提出,后来在19得到论证,通过研究者多年观察某种鸟类迁徙过程,发现其都是固定时间生产和迁徙,发现比起时间,日照和温度的影响更大;
第4段讲热带因为日照季节差别小,所以不根据日照生产,但是人工条件下发现日照还是有影响的;最后讲到日长对动物繁殖生产有影响,但是影响不同。一般大的哺乳动物怀孕4-7月,但是马要怀孕11月。
词汇题:
1.formulate = investigate
2.invariable = always
3.retained = kept
篇5:托福阅读真题解析
Passage Two学科分类:生物
题目:The north long-neck turtle
内容回忆:
第1段介绍了生活在澳洲热带的long-neck turtle,它们的栖息地非常地特殊,会随着干湿两季的不同,改变栖息地;
第2段讲到研究者们找了两年也没有找到这种龟的栖息地,但是当地的土著人知道,他们知道这种龟会将蛋产在水下。为了验证这个说法,研究者在水下放了很多radio transmitter,turtle下蛋的时候,transmitter会附在蛋上,结果真的发现,long-neck turtle会在水下14-17米的泥下下蛋;
第3段讲为什么turtle会选这里下蛋,这和它们生存的环境有关,它们生存的环境没有稳定的水,干湿两季是主要原因。
第4段讲到 为什么这种龟下蛋在水下,蛋可以生存下来,不同于别的蛋,它们的蛋特别抗压。
词汇题:
1.ingenious = comprehensive
2.feat = achievement
3.bizarre = strange
4.unpredictable = viable
篇6:托福阅读真题解析
Passage One学科分类:生物
题目:Body temperature
内容回忆:
第1段动物需要保持体温,还需要将热量传输到表面皮肤。表面的温度低于内部才会产生热量的传输。
第2段产生热量的是少部分器官,比如人体中的chest,abdomen,brain产生的热量就占所有热量的72%。
第3段运动的时候,会产生更多的热量,要比平时多上十多倍的热量,主要是肌肉产生。
第4段说的内部温度也不是都一样的,inner的温度保持恒定,但是器官直接也有温度差,可能会有0.5度的差别。
第5,6段主要讲热量是怎么传输到表面的。最后两段主要内容讲到,体温会根据日常的活动调节,不同的动物会不一样。比如夜行动物在夜间体温高,白天低。
词汇题:
1.uniform = constant
2.considerably = greatly
3.significance = importance
4.roughly = approximately
篇7:托福阅读真题解析
Passage Four学科分类:历史
题目:The United State interstate highway system
内容回忆:
第1段提出北美高速系统的建立,在1956年提出,1990年建立。主要还提到这个系统的三好处,加速,安全等等;
第2段讲到缺点,路的选择少,要绕,所以更费燃料,造成更大污染;
第3,4段讲这对老城区的巨大伤害,因为规划站在whole state的角度,对个别城市和古老社区考虑不周,造成破坏和萧条;
第5段讲到造成了new order,更多中心在郊区发展起来,更多人会在周末假期出去玩。;最后说到highway system和subway系统的重和。
词汇题:
1.alter = change
2.integrated = combined
3.hasten = sped up
篇8:TPO托福阅读真题答案及解析
托福阅读真题:
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.
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.
TPO托福阅读题目
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 of 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 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.
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.
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