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] 【C6】

选项 A、start
B、produce
C、become
D、appeal

答案 C

解析从语法结构分析，此处应填入一个系动词。四个选项中，只有C项become可作系动词。其他三项中，A项start和B项produce是及物动词，D项appeal(呼吁)是不及物动词，它们都不能后接形容词。

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