2. 外语
  3. Scientists are learning more about our need for sleep. Most people sleep 【26】______ eight hours each night. 【27】______ people sl

Scientists are learning more about our need for sleep. Most people sleep 【26】______ eight hours each night. 【27】______ people sl

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问题     Scientists are learning more about our need for sleep. Most people sleep 【26】______ eight hours each night. 【27】______ people sleep more than 【28】______ and others sleep as 【29】______ as two or three hours each night. Scientists do not know exactly 【30】______ some people sleep more than others. Dr. Ernest Hartman has a(an) 【31】______ about this. He believes that the 【32】______ of sleep depends on how a person 【33】______ problems. He said people who need only a few 【34】______ sleep usually are people who have much energy and make good use of 【35】______ to get their work to be done quickly. 【36】______ he said many people who sleep longer than normal do creative work and seem to need 【37】______ dreaming time to find solution 【38】______ emotional problems. Some scientists agree 【39】______ this idea and others dispute.
    To determine the 【40】______ of the lack of sleep, scientists have put 【41】______ through a set of psychological and performance tests 【42】______ them, for instance, to add columns of numbers or recite a passage read to them only minutes earlier, "We’ve found that if you’re in sleep 【43】______ , performance suffers," says Dr. David. "Short-term memory is 【44】______ , 【45】______ are abilities to make decisions and to concentrate."
选项 A、for
B、at
C、in
D、since
答案A
解析 此题考查的是介词与时间表达的搭配。for表示持续一段时间。at表示在一个时间点，如at 3:00 a．m、in表示在某一年、某一月，或一段时间之后。since表不“自从……以来”。联系本句，“多数人每晚需要8个小时的睡眠”中的“8个小时”是一段时间，因此应该选择A项。
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