名师心血之作，考生必备最完美阅读资料，让GRE阅读更加完美，打造你的完美GRE分数，走过路过不要错过，命运掌握在自己手中，GRE掌握在自己手中，每日练一练，分数节节高，你值得拥有，且看且珍惜!GRE必胜!
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
认真看完题目的考生，请允许小编为你狠狠鞠上一躬，征服美利坚不是梦啊!希望每位考生在考前都能做好充分的准备，得到自己理想的分数!
2015年最新GRE阅读每日一练(11月27日) http://gre.zhan.com/tifen/38428.html
2015年最新GRE阅读每日一练(11月26日) http://gre.zhan.com/tifen/38381.html
