[单项选择]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 pe
A. thinking
B. idea
C. suggestion
D. ponder

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[单项选择]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 pe
A. for
B. at
C. in
D. since

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