2. 外语
  3. The recently announced discovery of the first known planet orbiting a pulsar (the ultradense, pulsating remnant off the supernov

The recently announced discovery of the first known planet orbiting a pulsar (the ultradense, pulsating remnant off the supernov

admin2021-03-28  71
问题     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.
Which of the following best describe the organization of the passage?
选项 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
解析 similar phenomenon指的是脉冲星周围的行星；Two sets of research findings指的是本文两段对两颗不同脉冲星的研究；theoretical implication of each对应两段对各自发现所给出的理论意义：第一个发现从理论上说是不存在的，第二个发现从理论上说是可信的，选项A正确，B项本文两段呈现了两种关于脉冲星行星的理论解释，但是并没有哪种解释是被否决的。C项a set of observational data不对，本文两段呈现了两个观察。D项the same material会让人以为两段描述的是同一颗脉冲星，其实是两颗不同的脉冲星。E项文中未提及an approach to further investigation。
转载请注明原文地址:https://www.kaotiyun.com/show/nLVO777K
本试题收录于： GRE VERBAL题库GRE分类
0

GRE VERBAL

GRE

相关试题推荐
随机试题
最新回复(0)