【备考每日练】GRE阅读题之动物的水上迁徙

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每日一练

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

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