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  3. A unique laboratory at the University of Chicago is busy only at night. It is a dream laboratory where researchers are【C1】______

A unique laboratory at the University of Chicago is busy only at night. It is a dream laboratory where researchers are【C1】______

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问题     A unique laboratory at the University of Chicago is busy only at night. It is a dream laboratory where researchers are【C1】______work studying dreamers. Their findings have【C2】______that everyone dreams from three to seven times a night, although in【C3】______life a person may remember【C4】______or only one of his dreams.
    While the subjects—usually students—sleep, special machines【C5】______their brain waves and eye movements【C6】______the body movements that【C7】______the end of a dream. Surprisingly, all subjects sleep【C8】______
    Observers report that a person usually【C9】______before a dream.【C10】______the dream has started, his body【C11】______and his eye became more【C12】______, as if the curtain has【C13】______on a show. As soon as the machine【C14】______that the dream is over, a buzzer【C15】______the sleeper. He sits up, records his dream, and goes back to sleep—perhaps to dream some【C16】______
    Researchers have found that【C17】______the dreamer is wakened immediately after his dream, he can usually【C18】______the entire dream. If he is【C19】______to sleep even five more minutes, his【C20】______of the dream will have faded.
【C17】
选项 A、whether
B、if
C、although
D、even if
答案B
解析
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