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GRE阅读模拟在线练习附答案七十八

2018-06-27 17:00:00来源：网络

　　为了辅助大家更好地备考GRE阅读考试，新东方在线托福网为大家整理了一些模拟练习题，分享给大家，希望对大家接下里的GRE阅读备考，有更好的帮助。

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..

　　Select the sentence that, according to the author, may answer the question he mentioned in the paragraph

　　正确答案: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.

　　以上就是关于“GRE阅读模拟在线练习附答案七十八”的内容，更多精彩内容，请关注GRE频道!


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