A unique laboratory at the University of Chicago is busy only at night. It i

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问题 A unique laboratory at the University of Chicago is busy only at night. It is a dream【C1】______where researchers are at work studying dreamers. Their findings have revealed that everyone dreams from three to seven times a night,【C2】______ in ordinary life a person may remember none or only one of his dreams.
While the【C3】______ sleep, special machines record their brain waves and eye movements as well as the body movements that【C4】______ the end of a dream. Surprisingly, all subjects【C5】______ soundly.
Observers report that a person usually fidgets before a dream. Once the dream has started, his body relaxed and his eyes【C6】______ more active, as if the curtain had gone on a show. As soon as the machine【C7】______ that the dream is over, a buzzer wakens the sleeper. He sits up, records his dream, and goes back to sleep—perhaps to【C8】______ some more.
Researchers have found that if the dreamer is【C9】______ immediately after his dream, he can usually recall the entire dream. If he is allowed to sleep even five more minutes his【C10】______ of the dream will have faded. [br] 【C5】

选项 A、work
B、wake
C、sleep
D、remain

答案 C

解析从本句的surprisingly(令人惊讶的是)和soundly(充分地)可推知，此处应选择C项sleep。句意为：令人惊讶的是所有的实验对象都睡得很香。A、B、D三个选项都与上文意思不符。

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