公共英语三级

单选题阅读下列文章,选出题的最佳答案:
      A special lab at the University of Chicago is busy only _41_ It is a dream _42_ where researchers ale at work  _43_ dreamers.Their findings have concluded that _44_ dreams from three to seven times each night,_45_ in ordinary life a person may _46_ none or only one of his dreams.
      While the _47_ sleep,special machines _48_ their brain waves and eye movements as well as the body movements that  _49_ the end of a dream.Surprisingly,all subjects _50_ soundly. 
      _51_ say that a person usually fidgets(烦躁)before a dream. _52_ the dream has started.his body relaxes and his eyes _53_ more active,as if the curtain _54_ on a show.When the machine _55_ that the dream is over,a buzzer wakes the _56_.He sits up,records his dream, and goes back to sleep--perhaps to _57_ some more.
      Researchers have found that if the dreamer,is _58_ immediately after his dream.he can usual1y recall the entire dream.If he is allowed to sleep even _59_ his _60_ of the dream will have faded That’s why most people have many dreams at night,but forget most of them in the morning.

参考答案:C进入在线模考
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此题考查对这篇文章的主要内容的宏观掌握。本篇是关于研究人员在实验室里研究人做梦的类型。at night符合题 。