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  3. Researchers have found that REM(rapid eye movement)sleep is important to human beings. This type of sleep generally occurs four

Researchers have found that REM(rapid eye movement)sleep is important to human beings. This type of sleep generally occurs four

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问题     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 last.
    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.
The word "deeper" in paragraph 1 is closest in meaning to which of the following?
选项 A、heavier.
B、louder.
C、stronger.
D、happier.
答案A
解析 英文中可以用来描述“熟睡、沉睡”等的词汇有deep，sound，heavy等。“deepsleep”意为“深度睡眠，沉睡”，“heavy sleep”意为“熟睡”，“sound sleep”意为“酣睡”，故答案为A。
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