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GRE阅读理解(Barron模考)每日一题 第78期
日期:2014-12-03 09:36

(单词翻译:单击)

阅读理解

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

参考答案

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.

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重点单词
  • compensatev. 偿还,补偿,付报酬
  • magneticadj. 有磁性的,有吸引力的,催眠术的
  • speciesn. (单复同)物种,种类
  • compassn. 指南针,圆规 vt. 图谋,包围,达成
  • mysteriousadj. 神秘的,不可思议的
  • navigationn. 航行,航海,导航
  • fantasticadj. 极好的,难以置信的,奇异的,幻想的
  • navigatevi. 航行,驾驶,操纵 vt. 航行,驾驶
  • flockn. 一群(人,兽),大堆 v. 成群而行,聚集
  • determinev. 决定,决心,确定,测定