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GRE阅读题目练习:动物的水上迁徙

2019-09-04 15:08:00来源：网络

　　为了帮助大家高效备考GRE，新东方在线GRE频道为大家带来GRE阅读题目练习:动物的水上迁徙，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　A mysterious phenomenon is the ability of over-water migrants to travel on course. Birds, bees, andother species can keep track of time without anysensory cues from the outside world, and such“biological clocks” clearly contribute to their“compass sense.” For example, they can use theposition of the Sun or stars, along with the time ofday, 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 propernortheasterly. Course to compensate. Perhaps, some scientists thought, migrants determinetheir geographic position on Earth by celestial navigation, almost as human navigators usestars and planets, but this would. Demand of the animals a fantastic map sense. Researchersnow know that some species have a magnetic sense, which might allow migrants todetermine their geographic location by detecting variations in the strength of the Earth’smagnetic 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 toexpress:

　　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

　　正确答案

　　B B

　　以上就是关于“GRE阅读题目练习:动物的水上迁徙”的内容，更多精彩内容，请关注GRE频道!


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