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GRE阅读模拟练习题(58)

2017-06-03 16:10:00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!

  The nearly circular orbits of planets in our solar system led scientists to expect that planets around other stars would also reside in circular orbits. However, most known extrasolar planets reside in highly elongated, not circular, orbits. Why? The best clue comes from comets in our solar system. Comets formed in circular orbits but were gravitationally flung into their present-day elliptical orbits when they ventured too close to planets. Astronomers suspect that pairs of planets also engage in this slingshot activity, leaving them in disturbed, elliptical orbits. If two planets form in close orbits, one will be scattered inward (toward its star), the other outward. They will likely then travel close enough to neighboring planets to disturb their orbits also.

  1.According to the passage, which of the following factors help account for the elliptical shape of the orbits of extrasolar planets?

  A:The planets’ formation in close proximity to other planets

  B:The gravitational influence of planets whose original orbits have been disturbed

  C:The gravitational influence of comets

  答案:AB

  2.The passage suggests that two planets formed in close orbits that engaged in “slingshot activity”(lines 10-11) would be likely

  A:deflect away from each other

  B:change the shape of each other’s orbit

  C:affect the orbits of any neighboring planets

  答案:ABC

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  以上就是新东方在线GER频道为你带来的GRE阅读模拟练习题,更多精彩敬请关注新东方在线GRE频道。


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