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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.
Which of the following is the best title of the article?
选项 A、REM Sleep.
B、Two Types of Sleep.
C、Sleepers.
D、What Happens to Sleepers.
答案A
解析 根据首段首句“Researchershave found that REM…human beings．”可知文章的中心论题是REM sleep(快速眼动睡眠)，第2段和第3段围绕中心论题讲述了快速眼动睡眠时的生理变化及其特点，故判断答案为A。
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