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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

　　【GRE阅读题目解析:石头脱离地球引力】GRE考试考什么？GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:石头脱离地球引力，答案见下一页，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　查看全部：GRE阅读答案解析(汇总)

　　GRE阅读题目解析:石头脱离地球引力

　　P2

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

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

　　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.

　　点击下一页查看答案：

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