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GRE阅读原题300篇,有答案哦

2018-12-17 16:07 三立在线 admin

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摘要:PRIORITY 1 LEVEL 2 1. Scientists previously believed that the Scientists previously believed that the rocky planetsEarth, Mercury, Venus, and Marswere generated by the quick gravitational collapse of a dust cloud, a deflation giving rise to a dense orb. That point was challenged in the 1960s, when studies of Moon craters suggested that these craters were caused by the impact of objects that were in great abundance about 4.5 billion years ago but

   PRIORITY 1

  LEVEL 2

  1.  Scientists previously believed that the

  Scientists previously believed that the rocky planets—Earth, Mercury, Venus, and Mars—were generated by the

  quick gravitational collapse of a dust cloud, a deflation giving rise to a dense orb. That point was challenged in the

  1960s, when studies of Moon craters suggested that these craters were caused by the impact of objects that were in

  great abundance about 4.5 billion years ago but whose number seemed to have rapidly reduced shortly thereafter.

  This observation revitalized Otto Schmidt’s 1944 theory of accretion. According to this theory, cosmic dust steadily

  lumped into ever-larger conglomerates: particulates, gravel, small and then larger balls, planetesimals (tiny planets),

  and, ultimately, planets. As the planetesimals turned larger, their numbers reduced. Consequently, the number of

  collisions between planetesimals decreased.

  1.  The passage provides evidence that Schmidt would be likely to disagree with the theory presented in the first

  sentence over

  A.  the length of time it took for the rocky planets to form.

  B.  the most likely causes of the Moon’s impact craters.

  C.  the importance of cosmic dust as a seminal material in planetary formation.

  2.  Which of the following best describes the “observation” (line 6) referred to in the passage?

  A.  The rocky planets were created by the rapid gravitational collapse of a dust cloud.

  B.  Certain features on the Moon’s surface are impact craters caused by collisions with objects such as

  planetesimals.

  C.  The rocky planets were formed by a slow accretion of cosmic dust into increasingly larger bodies.

  D.  The number of objects colliding with the Moon appears to have been high for a while and then rapidly

  diminished.

  E.  There are far fewer planetesimals in existence today than there were about 4.5 billion years ago.

  【10201】

 

 

 

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