GRE阅读笔记NO6-1.doc

NO6-1 by——zhtwd A mysterious phenomenon is the ability of SE 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 con- SE tribute to their “compass sense.” For example, 促进 they can use the position of the Sun or stars, along with the time of day, to find north. But 转折 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. Per- haps, some scientists thought, migrants deter- SE mine their geographic position on Earth by ce- lestial navigation, almost as human navigators use stars and planets, but this would demand of SE 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. 文章结构类型：解释针对问题性文章。文章首句提出一个有待阐述的现象，然后提出了一种“罗盘效应”的解释，然后否定了此解释，又提出了“天体导航”的解释，然后又否定了这种解释，最后作者提出了“磁场感应”的解释，认为它有可能成为有效的解释。 准TS：（无TS）But this would demand of the animals a fantastic map sense. Researchers now know that some species have a magnetic sense. 单词： 阅读专用词汇：fantastic，phenomenon 积累专业词汇：biological clock, celestial navigation, magnetic 在水面上空迁移的动物能够沿着正确方向飞行，这实乃一种神秘莫测的现象。鸟类、蜜蜂、以及其它动物种类可以追踪时辰，而不必依赖于来自外界的任何感觉醒示物，这样的“生物钟”（biological clock）显然促进了其“方位感”（compass sense）。例如，它们可利用太阳或星辰的位置，连同白昼的时辰，来寻找到北方这一方位。但是，方位感本身不足以解释鸟类是如何在海洋上空导航的：当一群东飞的候鸟被暴风雨吹向偏南方之后，这群鸟会采取适度的东北方向以补偿误差。某些科学家认为，或许，迁移动物是通过天体导航（celestial navigat