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GRE阅读模拟练习题(265)

2017-05-22 15:33:00来源:网络

  为了帮助大家练习GRE阅读题考点,新东方在线GRE频道为大家带来GRE阅读模拟练习题一文,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!

  When rats are placed under conditions of stress, their adrenal glands immediately increase production of the hormone corticosterone, and soon thereafter the rats’ white blood cell count drops substantially. Yet rats without functioning adrenal glands experience little decrease in white blood cell count when placed under conditions of stress. It is likely, therefore, that anincrease in corticosterone produced by a rat’s adrenal glands causes the rat’s white blood cell count to decrease.

  Which of the following would it be most useful to know in evaluating the reasoning of the argument?

  A:Whether the drop in white blood cell count that occurs in rats under conditions of stress is sufficient to make the rats more susceptible to diseases that white blood cells normally combat

  B:Whether normal white blood cell counts vary widely among healthy rats that are not under conditions of stress

  C:Whether the adrenal glands of rats that are under conditions of stress increase production of any hormone other than corticosterone

  D:Whether the adrenal glands of rats produce elevated levels of corticosterone on occasions when the rats are not under conditions of stress

  E:Whether rats’ adrenal glands are affected by hormones produced by any of the rats’ other organs

  答案:C

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