题目
根据以下内容,回答下列各题。 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. According to the passage, how often does REM sleep occur in one night?
A.Once
B.Twice
C.Four of five times
D.Forty times
第3题
请根据以下内容回答下列各题The passage mainly discusses __________.
A.award-winning works of literature
B.an organization that awards artists
C.the special donation of an artist
D.the individual patrons of artists
第4题
根据以下内容,回答下列各题:
A.动作电位
B.阈电位
C.局部电位
D.静息电位
E.后电位
终板电位是()。
第7题
根据以下内容,回答下列各题:
A.麻风病
B.霍乱
C.人感染高致病性禽流感
D.艾滋病
E.天花
甲类传染病()。
第9题
A.数量指标综合指数
B.个体指数
C.质量指标综合指数
D.总指数
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