根據(jù)以下內(nèi)容，回答下面試題。
　　Passage Three
　　Researchers have found that REM (rapid eye movement) sleep is important to human beings. This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence. The deeper a person's sleep becomes, ~the longer the periods of rapid eye movement.
　　There are physical charges in the body to show that a person has changed from NREM( non-rapid eye movement) to REM sleep. Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly,
　　Accompanying these physical changes in the body is a very important characteristic of REM sleep. It is during REM sleep that a person dreams..
　　第44題　According to the passage,, how often does REM sleep occur in one night? __________
　　A.Once　　B.Twice　　C.Four or five times　　D.Forty times
　　答案：C
　　第45題　The word "deeper" in Paragraph 1 is closest in meaning to which of the following? __________
　　A.heavier.　　B.louder.　　C.stronger.　　D.Happier.
　　答案：A
　　第46題　Which of the following shows that a person is NOT dreaming in his sleep?__________
　　A.His eyes begin to move.　　B.His breathing-becomes faster.
　　C.His heart rate increases.　　D.His eyes stop moving.
　　答案：D
　　第47題　The subject of this passage is__________.
　　A.why people sleep　　B.the human need for REM sleep
　　C.the characteristic of REM sleep　　D.physical changes in the human body
　　答案：C

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