2013年英语四级阅读试题及答案3_第2页

　　21. What does the passage say about asteroids and meteoroids?

　　A) They are heavenly bodies different in composition.

　　B) They are heavenly bodies similar in nature.

　　C) There are more asteroids than meteoroids.

　　D) Asteroids are more mysterious than meteoroids.

　　[答案及分析]：[B]文章第二段第一句明确指出“小行星和划破夜空的流星是性质一样的物质，只是体积大些。”解题的关键是对version的理解。

　　22. What do scientists say about the collision of an asteroid with Earth?

　　A) It is very unlikely but the danger exists.

　　B) Such a collision might occur once every 25 years.

　　C) Collisions of smaller asteroids with Earth occur more often than expected.

　　D) It's still too early to say whether such a collision might occur..

　　[答案及分析]：[A]文章倒数第二段对小行星撞击地球的可能性作出了很形象的描述，每50万年才可能有一次，但一旦发生，将是地球末日。

　　23. What do people think of the suggestion of using nuclear weapons to alter the

　　course of asteroids?

　　A) It sounds practical but it may not solve the problem.

　　B) It may create more problems than it might solve.

　　C) It is a waste of money because a collision of asteroids with Earth is very

　　unlikely.

　　D) Further research should be done before it is proved applicable.

　　[答案及分析]：[B]文章最后一段道出了人们的担忧。正如纽约时报的一篇文章所言：“人们对巨石的担心，还不如对用以对付它们的巨型核舰队的担心更甚。”

　　24. We can conclude from the passage that .

　　A) while pushing asteroids off course nuclear weapons would destroy the world

　　B) asteroids racing across the night sky are likely to hit Earth in the near future

　　C) the worry about asteroids can be left to future generations since it is unlikely

　　to happen in our lifetime

　　D) workable solutions still have to be found to prevent a collision of asteroids

　　with Earth.

　　[答案及分析]：[D]本文虽然提到了用核武器对付小行星的建议，但同时指出人们对这种解决方法担心重重，可见，可行的解决方法仍在寻找之中。

　　25. Which of the following best describes the author's tone in this pass age?

　　A) Optimistic. B) Critical. C) Objective. D) Arbitrary.

　　[答案及分析]：[C]本文在引述观点及例证时，用了不少间接引语或直接引语，说明出处或原述者。可见本文是一篇对事实情况的客观报道。