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GMAT阅读题型练习(1318)

2018-05-09 09:04:00来源:网络

  本文来自GMAT阅读题库(点击查看更多),为考生提供GMAT阅读题目练习及答案解析,希望对大家GMAT备考有所帮助。点击下载更多GMAT备考必备资料。更多精彩尽请关注新东方在线GMAT频道!

  GMAT阅读题目内容

  (This passage was excerpted from material published in 1996.)

  When a large body strikes a planet or moon, material is ejected, thereby creating a hole in the planet and a localdeficit of mass. This deficit shows up as a gravity anomaly: the removal of the material that has been ejected to make the hole results in an area of slightly lower gravity than surrounding areas. One would therefore expect that all of the large multi-ring impact basins on the surface of Earth's Moon would show such negative gravity anomalies, since they are, essentially, large holes in the lunar surface. Yet data collected in 1994 by the Clementine spacecraft show that many of these lunar basins have no anomalously low gravity and some even have anomalously high gravity. Scientists speculate that early in lunar history, when large impactors struck the Moon's surface, causing millions of cubic kilometers of crustal debris to be ejected, denser material from the Moon's mantle rose up beneath the impactors almost immediately, compensating for the ejected material and thus leaving no low gravity anomaly in the resulting basin. Later, however, as the Moon grew cooler and less elastic, rebound from large impactors would have been only partial and incomplete. Thus today such gravitational compensation probably would not occur: the outer layer of the Moon is too cold and stiff.

  3、Which of the following best describes the organization of the passage?

  A.An anomalous finding is cited, the data used to support that finding are analyzed, and the finding is modified.

  B.A theory about a phenomenon is introduced, data seeming to disprove that theory are analyzed, and the theory is rejected.

  C.A phenomenon is described, a finding relating to the phenomenon is discussed, and a possible explanation for that finding is offered.

  D.A debate among scientists regarding the explanation for a particular phenomenon is outlined, and one position in that debate is shown to be more persuasive.

  E.The observation of an astronomical event is described, and two schools of thought about the explanation for that event are discussed.


  

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