92年4月gre考试阅读真题解析(B)-智课教育旗下智课教育.pdf

智 课 网 G R E 备 考 资 料 92年4月gre考试阅读真题解析(B)-智课教育旗下智课教 育 新gre考试阅读中对于逻辑题的考生是一个重点，但真题也不容错 过。复习gre考试阅读的时候，gre考生应该以往年的真题为复习材料， 从真题中总结阅读规律和特点才是制胜法宝。 新gre考试阅读中对于逻辑题的考生是一个重点，但真题也不容错 过。接下来的几天给大家整理了历届gre考试阅读真题及解析，下面这 篇是1992年4月gre考试阅读真题SECTION B部分。复习gre考试阅读的 时候，gre考生应该以往年的真题为复习材料，从真题中总结阅读规律 和特点才是制胜法宝。 Recently some scientists have concluded that meteorites found on Earth and long believed to have a Martian origin might actually have been blasted free of Mars’s gravity by the impact on Mars of other meteorites. This conclusion has led to another question: whether meteorite impacts on Earth have similarly driven rocks from this planet to Mars. 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. 17. The passage is primarily concerned with (A) presenting an argument to support a particular hypothesis (B) suggesting an answer to a theoretical question (C) questioning the assumptions of a research project (D) criticizing experimental results (E) explaining the origin of certain scientific data 18. According to the passage, which of the following events may have initiated the process that led to the presence on Earth of meteorites from Mars? (A) A meteorite struck the Earth with tremendous velocity. (B) A meteorite collided with Mars. (C) Approximately 1,000 rocks were ejected from Mars. (D) The orbits of Earth and Mars brought the planets to their closest points. (E) Rocks from a meteorite impact broke free of Earth’s g