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GRE阅读题目解析:石头脱离地球引力

2017-04-06 10:49:09来源:新东方在线整理

  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。

  (meteorite 陨石)

  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,只有火星的石头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,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

  文段细节不少,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,以此来计算击中火星概率。所选项必须跟实验条件相关,才可能用来质疑结果,其他的可以排除。

  A 正确。它质疑了模拟实验的条件之一 random directions,不 random 所以结果有问题。

  B 跟模拟实验无关。

  C 无关。

  D 石头脱离地球的速度比击中地球的速度低。胡说八道选项。

  E 火星上还没有发现超过 60 miles 的坑。

  以上就是新东方在线GER频道为你带来的GRE阅读题目解析:石头脱离地球引力,更多精彩敬请关注新东方在线GRE频道。

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