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GRE阅读题目解析:星空中的黯淡区域

2017-03-06 18:30:00来源:网络

  GRE阅读题目解析:星空中的黯淡区域GRE考试考什么?GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:星空中的黯淡区域答案见下一页,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!

  查看全部:GRE阅读答案解析(汇总)

  GRE阅读题目解析:星空中的黯淡区域

  P1

  The dark regions in the starry night sky are not pockets in the universe that are devoid of stars as had long been thought. Rather, they are dark because of interstellar dust that hides the stars behind it. Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars. The average density of interstellar material in the vicinity of our Sun is 1,000 to 10,000 times less than the best terrestrial laboratory vacuum. It is only because of the enormous interstellar distances that so little material per unit of volume becomes so significant. Optical astronomy is most directly affected, for although interstellar gas is perfectly transparent, the dust is not. (125 words)

  1. According to the passage, which of the following is a direct perceptual consequence of interstellar dust EXCEPT?

  □A Some stars are rendered invisible to observers on Earth.

  □B Many visible stars are made to seem brighter than they really are.

  □C The dust is conspicuously visible against a background of bright stars.

  2. It can be inferred from the passage that it is because space is so vast that

  (A) little of the interstellar material in it seems substantial

  (B) normal units of volume seem futile for measurements of density

  (C) stars can be far enough from Earth to be obscured even by very sparsely distributed matter

  (D) interstellar gases can, for all practical purposes, be regarded as transparent

  (E) optical astronomy would be of little use even if no interstellar dust existed

  点击下一页查看答案:

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