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GRE阅读题目解析:越洋迁徙动物

2017-03-06 18:30:00来源:网络

  P3

  1

  A mysterious phenomenon is the ability of over-water migrants to travel on course.

  越洋迁徙的动物能够制定航线,真是不可思议。

  2

  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".

  鸟类,蜜蜂,和其他一些动物能够不借助任何外界的线索来捕捉时间的流逝,而这种 “ 生物钟 ” 显然也促使它们进化出 “ 方向感 ” 。

  3

  For example, they can use the position of the Sun or stars, along with the time of day, to find north.

  比如说,它们可以利用太阳或星星的方位,结合时间(体内的生物钟告诉它们的时间)来确定北方。

  4

  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.

  然而,只靠方向感不能解释鸟类如何飞越大洋:一群东飞的鸟被风暴裹挟南移相当一段距离后,他们会补偿性地飞往东北方向。

  5

  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.

  一些科学家认为,也许这些动物借助天文航海术的原理来确定它们所在的位置,如同人类借助星空辨识方位,但这种假设成立的前提是动物具备想象一副地图的能力。

  6

  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. (157 words)

  研究者们现在了解到,某些物种能够感知地磁场,动物也许可以通过感知地磁场的强弱来确定它们的地理位置。

  6. The main idea of the passage is that

  (A) migration over land requires a simpler explanation than migration over water does

  (B) the means by which animals migrate over water are complex and only partly understood

  (C) the ability of migrant animals to keep track of time is related to their magnetic sense

  (D) knowledge of geographic location is essential to migrants with little or no compass sense

  (E) explanations of how animals migrate tend to replace, rather than build on, one another

  选B。

  A 陆地上的迁徙,陌生内容。

  B 正确项。动物涉水迁徙的机制复杂,目前只能部分解释。

  C 感知时间的能力是动物体内的生物钟的作用,见句 2 。

  D 文中提到的动物,都是具备方向感的,对于不具备方向感的动物,确定其地理位置的知识对它们重不重要我们不知道。不要发散地理解为:“已经不能辨认方向,如果还不认识路就太惨了。” 不要把自己的路痴经验代入制造发散。

  E 文章没有明确地否认句 5 的猜测(也许只是还没有找到证据,证明动物可以想象地图),也就谈不上取代,或者在其基础上发展了。

  7. It can be inferred from the passage that if the flock of birds described in lines 8-9 were navigating by compass sense alone, they would, after the storm, fly

  (A) east

  (B) north

  (C) northwest

  (D) south

  (E) southeast

  选A。

  如果只具备方向感,被吹到南边的鸟稳定后,将继续向东飞。

  8. Of the following descriptions of migrating animals, which most strongly suggests that the animals are depending on magnetic cues to orient themselves?

  (A) Pigeons can properly readjust their course even when flying long distances through exceedingly dense fogs.

  (B) Bison are able to reach their destination by passing through a landscape that has been partially altered by a recent fire.

  (C) Elephants are able to find grounds that some members of the herd have never seen before.

  (D) Swallows are able to return to a given spot at the same time every year.

  (E) Monarch butterflies coming from different parts of North America are able to arrive at the same location each winter.

  选A。

  让我们选择下述迁徙动物中,最能表现是靠着地磁信号来确定方向的。

  因为文章中提到的依靠地磁信号确定方位的例子只有鸟类,那么 B 野牛,C 大象,E 王蝶,三项必然不如 A 鸽子,D 燕子更可期地符合题设。也许 BCE 中真的包含更典型地利用地磁确定方向的动物,但从文中无从推断,所以排除不犹豫。

  燕子返回指定地点,确切地说,是返回去年它筑的那个窝的所在地(一般是同一座建筑,也许另筑新窝,也许不会),如此精确地定位,很难说是单独借助地磁信号完成的,想以此证明是根据地磁场定向,不如 A 项更直接。

  鸽子可以在极浓的雾中长途飞行,并实时修正自己的航向,非常符合句4中出现的例子,所以 A 是最佳项。

  以上就是新东方在线GER频道为你带来的GRE阅读题目解析:越洋迁徙的动物,更多精彩敬请关注新东方在线GRE频道。

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