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

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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.
【C9】

选项 A、asleep
B、wakened
C、wakening
D、slept

答案B

解析 从本段的意思看,本句的意思是:"如果做梦人在梦后马上被叫醒,他通常能够回忆起整个梦。"因此,A、D两项均与题意不符。C项wakening指"正在醒来",而从上下文看,此处不是指他自己醒来,而是被人叫醒。另外,waken(醒来,睡醒)一词作不及物动词用,表示瞬间的动作,不用于进行时。所以正确答案为B项wakened(被叫醒)。
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