网站导航     在线客服  
2018托福真题解析汇总
学生选择在小站备考:30天 429280名,今日申请580人    备考咨询 >>

托福阅读真题练习:物种灭绝原因的文本+题目+答案

2017年12月08日14:05 来源:小站整理
参与(0) 阅读(1187)

托福备考资料免费领取

免费领取
摘要:托福阅读真题哪里有?大家平时备考托福阅读考试的时候都用的是哪些真题呢?除了TPO的托福阅读真题以外,大家进行托福阅读的练习大多数可能都是根据老托资料或者是课外资料来练习了。那么到哪里去找到托福阅读真题来进行练习呢?

托福阅读如何进行备考?除了大量的托福词汇储备以外,大家可能最需要的就是托福阅读真题的练习。那么除了TPO你还有哪些托福阅读真题进行练习呢?今天小编就为大家整理了托福阅读真题100篇:物种灭绝原因的文本、题目以及答案,希望可以帮助到大家。

托福阅读真题练习:物种灭绝原因的文本+题目+答案图1

托福阅读100篇真题练习汇总:http://toefl.zhan.com/tfziliao63739.html

托福阅读文本:

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish.

The exact causes of a species' death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species became extinct at the same time — a mass extinction. One of the best-known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when approximately 95 percent of all species died, mass extinctions can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the oceans. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. This periodic extinction might be due to intersection of the Earth's orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species' survival may have nothing to do with its ability or inability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.

托福阅读题目:

1. The word "it" in line 3 refers to

(A) environment

(B) species

(C) extinction

(D) 99 percent

2. The word "ultimately" in line 8 is closest in meaning to

(A) exceptionally

(B) dramatically

(C) eventually

(D) unfortunately

3. What does the author say in paragraph 1 regarding most species in Earth's history

(A) They have remained basically unchanged from their original forms.

(B) They have been able to adapt to ecological changes.

(C) They have caused rapid change in the environment.

(D) They are no longer in existence.

4. Which of the following is NOT mentioned in paragraph 1 as resulting from rapid ecological

change?

(A) Temperature changes

(B)Availability of food resources

(C) Introduction of new species

(D) Competition among species

5. The word "demise" in line 12 is closest in meaning to

(A) change

(B) recovery

(C) help

(D) death

6. Why is "plankton" mentioned in line 17?

(A) To demonstrate the interdependence of different species.

(B) To emphasize the importance of food resources in preventing mass extinction.

(C) To illustrate a comparison between organisms that live on the land and those that live in the

ocean.

(D) To point out that certain species could never become extinct.

7.According to paragraph 2, evidence from fossils suggests that

(A) Extinction of species has occurred from time to time throughout Earth's history.

(B) Extinctions on Earth have generally been massive

(C) There has been only one mass extinction in Earth's history.

(D) Dinosaurs became extinct much earlier than scientists originally believed.

8. The word "finding" in line 20 is closest in meaning to

(A) published information

(B) research method

(C) ongoing experiment

(D) scientific discovery

9. Which of the following can be inferred about the theory mentioned in Line 21-23?

(A) Many scientists could be expected to disagree with it.

(B) Evidence to support the theory has recently been found.

(C) The theory is no longer seriously considered.

(D) Most scientists believe the theory to be accurate.

10. In paragraph 3, the author makes which of the following statements about a species' survival?

(A) It reflects the interrelationship of many species.

(B) It may depend on chance events.

(C) It does not vary greatly from species to species

(D) It is associated with astronomical conditions.

11.According to the passage , it is believed that the largest extinction of a species occurred

(A) 26 million years ago

(B) 65 million years ago

(C) 225 million years ago

(D) 250 million years ago

托福阅读答案:

BCDCDAADAB C

以上就是小编为大家整理的托福阅读100篇真题练习:物种灭绝原因的文本、题目以及答案,大家在托福阅读考试进行备考的过程当中也可以拿这些题目来进行练习,相信对于你的托福阅读考试成绩提升会很有帮助。最后,小编预祝大家托福考试能取得理想的成绩。

小站托福
托福官方Q群 群号:857201332
精华资料下载 在线答疑 考友抱团
还可以第一时间参与福利活动哦
一键加入
特别申明:本文内容来源网络,版权归原作者所有,如有侵权请立即与我们联系contactus#zhan.com,我们将及时处理。
感觉茅塞顿开?现在就去练练手吧!
大家都在学

看完这篇文章有何感觉?已经有0人表态,0%的人喜欢

相关文章

110分托福大神力荐!搞定听说读写这些材料必备 托福加试全破解 轻松搞定加试这件小事儿 TPO54托福阅读passage3原文与翻译 生命的元素 最新托福独立写作完整版题目+范文汇总 托福阅读真题练习:100篇托福阅读原文+题目+答案 【小站原创】TPO44托福阅读文本及答案解析(Seagra... 16个托福阅读经典加试文章题答案汇总 托福机经之阅读机经 小站教育整理汇总
托福关键词