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GRE阅读:月球的起源

2017-02-01 16:41:00来源：!新东方在线

　　为了帮助大家提高GRE阅读成绩，进行有效的GRE阅读训练，新东方在线GRE频道为大家带来GRE阅读真题:月球的起源一文，希望对大家GRE备考有所帮助。点击查看更多>>

　　GRE阅读:月球的起源

　　Theorists are divided concerning the origin of the Moon. Some hypothesize that the Moon was formed in the same way as were the planets in the inner solar system (Mercury, Venus, Mars, and Earth)—from planet-forming materials in the presolar nebula. But, unlike the cores of the inner planets, the Moon’s core contains little or no iron, while the typical planet-forming materials were quite rich in iron. Other theorists propose that the Moon was ripped out of the Earth’s rocky mantle by the Earth’s collision with another large celestial body after much of the Earth’s iron fell to its core. One problem with the collision hypothesis is the question of how a satellite formed in this way could have settled into the nearly circular orbit that the Moon has today. Fortunately, the collision hypothesis is testable. If it is true, the mantlerocks of the Moon and the Earth should be the same geochemically.

　　17. The primary purpose of the passage is to

　　(A) present two hypotheses concerning the origin of the Moon

　　(B) discuss the strengths and weaknesses of the collision hypothesis concerning the origin of the Moon

　　(C) propose that hypotheses concerning the Moon’s origin be tested

　　(D) argue that the Moon could not have been formed out of the typical planet-forming materials of the presolar nebula(A)

　　(E) describe one reason why the Moon’s geochemical makeup should resemble that of the Earth

　　18. According to the passage, Mars and the Earth are similar in which of the following ways?

　　I. Their satellites were formed by collisions with other celestial bodies.

　　II. Their cores contain iron.

　　III. They were formed from the presolar nebula.

　　(A) III only

　　(B) I and II only

　　(C) I and III only

　　(D) II and III only(D)

　　(E) I, II, and III

　　19. The author implies that a nearly circular orbit is unlikely for a satellite that

　　(A) circles one of the inner planets

　　(B) is deficient in iron

　　(C) is different from its planet geochemically

　　(D) was formed by a collision between two celestial bodies(D)

　　(E) was formed out of the planet-forming materials in the presolar nebula

　　20. Which of the following, if true, would be most likely to make it difficult to verify the collision hypothesis in the manner suggested by the author?

　　(A) The Moon’s core and mantlerock are almost inactive geologically.

　　(B) The mantlerock of the Earth has changed in composition since the formation of the Moon, while the mantlerock of the Moon has remained chemically inert.

　　(C) Much of the Earth’s iron fell to the Earth’s core long before the formation of the Moon, after which the Earth’s mantlerock remained unchanged.

　　(D) Certain of the Earth’s elements, such as platinum, gold, and iridium, followed iron to the Earth’s core.(B)

　　(E) The mantlerock of the Moon contains elements such as platinum, gold, and iridium.

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