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GRE阅读考试模拟题及答案解析(13)

2016-03-18 15:44:04来源:网络

  P2

  1

  According to astronomer S.A. Phinney, kicking a rock hard enough to free it from Earth's gravity would require a meteorite capable of making a crater more than 60 miles across.

  根据天文学家P的观点,用足够大的力道去踢一块石头使它能脱离地球引力,这种力量相当于一块能够造成直径60英里大坑的陨石的破坏力。

  2

  Moreover, even if Earth rocks were freed by meteorite impact, Mars's orbit is much larger than Earth's, so Phinney estimates that the probability of these rocks hitting Mars is about one-tenth as great as that of Mars's rocks hitting Earth.

  另外,即便石头得到了陨石那么大的冲击力脱离地球,火星的轨道也比地球大得多,所以P估计这些石头到达火星的概率只有火星的时候到达地球的十分之一。

  3

  To demonstrate this estimate, Phinney used a computer to calculate where 1,000 hypothetical particles would go if ejected from Earth in random directions.

  为了论证这种估计,P用电脑模拟了假设有1000个质点缘随即方向从地球发射,会去往何处。

  4

  He found that 17 of the 1,000 particles would hit Mars.

  他发现,1000个质点有17个会到达火星。

  4. Which of the following, if true, would cast most doubt on Phinney's estimate of the probability of Earth rocks hitting Mars?

  ○A Rather than going in random directions, about 25 percent of all particles ejected from Earth go in the same direction into space.

  ○B Approximately 100 meteorites large enough to make a noticeable crater hit the Earth each year.

  ○C No rocks of Earth origin have been detected on Mars.

  ○D The velocity of rocks escaping from Earth's gravity is lower than the velocity of meteorites hitting the Earth.

  ○E No craters more than 60 miles across have been found on Mars.

  选A

  文段不长,但谈的细节不少,注意题目问的是哪一个选项可以质疑地球发射的石头击中火星的概率。

  根据句3我们已经知道模拟试验是随机发射1000个质点,以此来计算概率。所以选项必须跟试验内容或条件假设有关的内容,才可能用来质疑结果,理由中出现的与其他内容相关的描述和数据,可以直接排除。

  所以选A。

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