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【题目】As almost everyone knows, 1(become) extinct is to be gone forever. Natural extinction happens when a species declines in numbers gradually. Even before man's arrival on Earth, some species had died out quite 2(natural).

The ease of the dinosaurs is3most well-known example of natural extinction.4(they) disappearance is a natural one and new species of animals evolve (进化)to replace them.

The rate of extinction 5(speed) up unnaturally over the last 400 years.6(rise) sharply since 1900. This increase in the rate of extinction is directly related 7the increase in the human population over the same period of time. Vast numbers of humans have caused great damage to the planet, as humans have taken over a great many wild 8(habitat), forcing animals and plants into smaller and9(small) areas, until some of them have become extinct. We have also polluted our planet.10makes it unfit for wildlife. These causes of extinction are known as indirect destruction.

【答案】

1to become。

2naturally

3the

4Their

5has speeded

6rising

7to

8habitats

9smaller

10which

【解析】近四百年来物种在急剧的消失,人口的增长更加加剧了这一现象,人类不断地扩大生活空间,致使动植物的栖息地越来越小,甚至某些物种灭绝了。另外人类造成的污染也间接的导致了物种的灭绝。

1考查非谓语动词。句意:几乎每个人都知道,灭绝是永远消失。根据英语对称原则,表语为动词不定式,故主语应为不定式。故填to become。

2考查副词。句意:甚至在人类出现在地球之前,有些物种已经很自然地灭绝了副词修饰动词短语die out,故用naturally。

3考查冠词。句意:恐龙灭绝是最著名的自然灭绝的例子。形容词的最高级前加定冠词the。

4考查代词。句意:它们的消失是自然的新的动物物种进化会来代替他们。由空后的名词disappearance可知此处用形容词性物主代词。故填Their。

5考查动词时态。句意:在过去的400年里,物种灭绝异常加速了。由over the last 400 years 可知此处用现在完成时态。故填has speeded。

6考查非谓语动词。句意:从1900年以来急速上升。rise与逻辑主语the rate of extinction 是主动关系。故填rising。

7考查介词。句意:在同一时期,灭绝率的增长直接导致了人口的增长。be related to 与…有关。为固定搭配。故填介词to。

8考查名词的数。句意:大量的人类已经对地球造成了巨大的破坏,因为人类已经接管了许多野生的栖息地,迫使动物和植物进入越来越小的区域,直到其中一些已经灭绝。a great many 后加可数名词的复数。故填habitats。

9考查形容词的比较级。句意:大量的人类已经对地球造成了巨大的破坏,因为人类已经接管了许多野生的栖息地,迫使动物和植物进入越来越小的区域,直到其中一些已经灭绝。and连接两个比较级,意为“越来越……”。故填smaller。

10考查定语从句。句意:我们也污染了我们的地球,这使得它不适合野生动物。先行词为planet。故填关系代词which。

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