2. 外语
  3. A special lab at the University of Chicago is busy only【C1】______It is a dream【C2】______where researchers are at work【C3】______d

A special lab at the University of Chicago is busy only【C1】______It is a dream【C2】______where researchers are at work【C3】______d

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问题    A special lab at the University of Chicago is busy only【C1】______It is a dream【C2】______where researchers are at work【C3】______dreamers. Their findings have concluded that【C4】______dreams from three to seven times each night,【C5】______in ordinary life a person may【C6】______none or only one of his dreams.
   While the【C7】______sleep, special machines【C8】______their brain waves and eye movements as well as the body movements that【C9】______the end of a dream. Surprisingly, all subjects【C10】______soundly.
【C11】______say that a person usually fidgets before a dream.【C12】______the dream has started, his body relaxes and his eyes【C13】______more active, as if the curtain【C14】______on a show. When the machine【C15】______that the dream is over, a buzzer wakes the【C16】______. He sits up, records his dream, and goes back to sleep -- perhaps to【C17】______some more.
   Researchers have found that if the dreamer, is【C18】______immediately after his dream, he can usually recall the entire dream. If he is allowed to sleep even【C19】______his【C20】______of the dream will have faded.  
【C3】
选项 A、studying
B、studied
C、to study
D、having studied
答案A
解析 “studying”在文中作伴随状语，B、C、D项则不合适。
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