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GRE阅读模拟练习题(234)

2017-05-19 09:35:00 来源:网络GRE资料下载

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  The recently announced discovery of the first known planet orbiting a pulsar (the ultradense, pulsating remnant off the supernova explosion of a star) turned out to be based on faulty data. Had this discovery been confirmed, theorists would have had difficulty accounting for the existence of such a planet. The supernova would certainly have destroyed any preexisting planets. This particular pulsar is relatively young, allowing little time for a new planet to have coalesced, and it rotates relatively slowly, implying that it has not interacted with any nearby star since the supernova.

  But newer evidence of a different pulsar with planets is more promising. This is a rapidly spurring “millisecond pulsar” thought to be a much older object that has pulled gaseous material from a stellar neighbor, causing its rotational speed to increase. Leftover, unconsumed gas around such a pulsar could, in theory, coalesce into planets. Or the pulsar’s radiation might have vaporized a companion star, providing new material for planetary formation.

  1. The primary purpose of the passage is to

  A:provide an example of the dangers of a recent discovery based on faulty data

  B:illustrate the difficulty of explanation concerning a recent discovery

  C:assess the credibility of recent findings concerning the as yet unverified existence of a class of objects

  D:argue that a certain hypothesis fails to account for a seemingly contradictory phenomenon

  E:demonstrate how difficult it might be to find out the reality of a phenomenon

  答案:C

  2. Which of the following best describe the organization of the passage?

  A:Two sets of research findings relating to similar phenomenon are mentioned, and the theoretical implication of each are discussed.

  B:A theoretical explanation of a phenomenon is presented and rejected, and a more attractive alternative is offered.

  C:Two independent and divergent interpretations of a set of observational data are compared and one is favored over the other.

  D:An example of careless scientific research is introduced and contrasted with a more rigorous analysis of the same material.

  E:The state of knowledge of an unexplainable phenomenon is outlined and an approach to further investigation is recommended.

  答案:A

  3. Which of the following can be inferred regarding the pulsar discussed in the first paragraph?

  A:Theorists initially doubted its existence.

  B: If its existence had been confirmed, astronomers would and have turned their attention to the pulsar discussed in the second paragraph.

  C:If the supernovas explosions that created it had been more powerful, the resulting radiation would have preceded the subsequent formation of a planet.

  D:If it had interacted with a nearby star since the supernova explosion, it would rotate faster than it does.

  E:Astronomers’ interest in it ultimately led to a new theory of planetary formation.

  答案:D

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