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2015年9月20号GRE阅读机经解析之长阅读
9月20号GRE阅读机经解析之长阅读
想要知道刚刚过去的GRE考试中,GRE阅读究竟有什么题目吗?今天小编为考生分享2015年9月20号GRE阅读机经解析之长阅读。更多GRE考试真题请关注前程百利GRE官网。
长阅读
In 1995 the Galileo spacecraft captured data about Jupiters atmosphere--
namely, the absence of most of the predicted atmospheric water--that
challenged prevailing theories about Jupiters structure. The unexpectedness of
this finding fits a larger pattern in which theories about planetary composition
and dynamics have failed to predict the realities discovered through space
exploration. Instead of normal planets whose composition could be predicted
by theory, the planets populating our solar system are unique individuals whose
chemical and tectonic identities were created through numerous contingent
events. One implication of this is that although the universe undoubtedly holds
other planetary systems, the duplication of the sequence that produced our
solar system and the development of life on Earth is highly unlikely.
Recently planetary scientists have suggested that the external
preconditions for the development of Earths biosphere probably included four
paramount contingencies. First, a climate conducive to life on Earth depends
upon the extraordinarily narrow orbital parameters that define a continuously
habitable zone where water can exist in a liquid state. If Earths orbit were only
5 percent smaller than it is, temperatures during the early stages of Earths
history would have been high enough to vaporize the oceans. If the Earth-Sun
distance were as little as 1 percent larger, runaway glaciation on Earth about 2
billion years ago would have caused the oceans to freeze and remain frozen to
this day.
Second, Jupiters enormous mass prevents most Sun-bound comets from
penetrating the inner solar system. It has been estimated that without this shield,
Earth would have experienced bombardment by comet-sized impactors a
thousand times more frequently than has actually been recorded during
geological time.
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