A laboratory at the University of Chicago is busy only in night. 【S1】______ I is a dream laboratory that the

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问题     A laboratory at the University of Chicago is busy only in night.                    【S1】______
I is a dream laboratory that the researchers are studying dreamers.                    【S2】 ______
Their finding have revealed that everyone dreams several times a night                【S3】______
although in ordinary life a person may remember not or only one of his dreams.      【S4】 ______
While the dreamers asleep, special machines record their brain waves                  【S5】 ______
and eye movements as well as body movements that sign the end of a dream.           【S6】 ______
Surprising, all the dreamers sleep soundly.                                        【S7】______
    Researchers have found that if the dreamer is waken immediately                  【S8】______
after his dream, he usually remembers the entire dream. If he is allowed             【S9】 ______
sleep even five minutes, his memory of the dream will have faded.                    【S10】 ______

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答案in改为at。

解析 在夜间是at night,故我们应该把in night改为at night。
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