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GRE阅读模拟练习题(211)

2017-05-17 16:35:00来源：网络

　　为了帮助大家练习GRE阅读题考点，新东方在线GRE频道为大家带来GRE阅读模拟练习题一文，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!

　　Astronomers who study planet formation once believed that comets—because they remain mostly in the distant Oort cloud, where temperatures are close to absolute zero—must be pristine relics of the material that formed the outer planets. The conceptual shift away from seeing comets as pristine relics began in the 1970s, when laboratory simulations revealed there was sufficient ultraviolet radiation reaching comets to darken their surfaces and there were sufficient cosmic rays to alter chemical bonds or even molecular structure near the surface. Nevertheless, astronomers still believed that when a comet approached the Sun—where they could study it—the Sun’s intense heat would remove the corrupted surface layer, exposing the interior. About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve.

　　1. The author suggests that the realization described in the final sentence of the passage had which of the following effects?

　　A：It introduced a new topic for study by astronomers interested in planetary formation.

　　B：It led astronomers to adopt a number of different strategies in trying to determine the composition of cometary interiors

　　C：It called into question an assumption that astronomers had made about comets

　　D：It cast doubt on astronomers’ ability to study the interior parts of comets.

　　E： It caused astronomers to revise their account of the composition of the outer planets.

　　答案：C

　　2. It can be inferred that the author would agree with which of the following statements about the “laboratory simulations”?

　　A：The simulations showed that despite the low temperatures in the Oort cloud, there was sufficient energy there to alter comet

　　B：Astronomers were initially reluctant to accept what simulation showed about the composition of comets

　　C：The simulations themselves did not eliminate the possibility that comets contain pristine relics of material from the early solar system.

　　答案：AC

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