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GRE阅读真题在线练习附答案三十四

2018-05-13 15:30:00来源:网络

  为了帮助大家更好的提升GRE阅读分数,建议同学们在平时还是多进行真题的练习。这样有助于我们在整体上来提高阅读速度,把握阅读时间,熟练做题技巧等等。新东方在线托福网为大家带来了真题,供大家练习。

点击查看》》》【GRE阅读真题在线练习附答案汇总】

  A mysterious phenomenon is the ability of over-water migrants to travel on course. Birds, bees, and other species can keep track of time without any sensory cues from the outside world, and such “biological clocks” clearly contribute to their “compass sense.” For example, they can use the position of the Sun or stars, along with the time of day, to find north. But compass sense alone cannot explain how birds navigate the ocean: after a flock traveling east is blown far south by –a storm, it will assume the proper northeasterly. Course to compensate. Perhaps, some scientists thought, migrants determine their geographic position on Earth by celestial navigation, almost as human navigators use stars and planets, but this would. Demand of the animals a fantastic map sense. Researchers now know that some species have a magnetic sense, which might allow migrants to determine their geographic location by detecting variations in the strength of the Earth’s magnetic field.

  The main idea of the passage is that

  AMigration over land requires a simpler explanation than migration over water does

  BThe means by which animals migrate over water are complex and only partly understood

  CThe ability of migrant animals to keep track of time is related to their magnetic sense

  Dknowledge of geographic location is essential to migrants with little or no compass sense

  Eexplanations of how animals migrate tend to replace, rather than build on,one another

  The author maintains that migrating animals would need a fantastic map sense (line10) to determine their geographic position by celestial navigation mostly likely in order to express:

  AAdmiration for the ability of the migrants

  BSkepticism about celestial navigation as an explanation

  Ccertainly that the phenomenon of migration will remain mysterious

  DInterest in a new method of accounting for over-water migration

  ESurprise that animals apparently navigate in much the same way that human beings do

  参考答案:B B

  以上就是关于“GRE阅读真题在线练习附答案三十四”的内容,更多精彩内容,请关注GRE频道!

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