2. 外语
  3. Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If

Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If

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问题    Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop, your muscles will relax, and your breathing will slow and become quite regular. Your brain waves slow down a bit, too, with the alpha rhythm of rather fast waves predominating for the first few minutes. This is called stage I sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep, the slower your brain waves will be. Then, about 40 to 60 minutes after you lose consciousness, you will have reached the deepest sleep of all. Your brain waves will show the large slow waves that are known as the delta rhythm. This is stage 4 sleep.
   You do not remain at this deep fourth stage all night along, but instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep that most dreams seem to occur.
   Provided that you do not wake up during the first REM sleep period, your body will soon relax again, your breathing will grow slow and regular once more, and you will slip gently back from stage 1 to stage 4 sleep — only to rise once again to the surface of near consciousness some 80 minutes later.
According to the passage, which of the following is NOT a characteristic of REM sleep?
选项 A、The eyes dart around.
B、It lasts 8 to 15 minutes.
C、The delta rhythm is present.
D、The sleeper dreams.
答案C
解析 在第二段介绍REM睡眠时，作者分别在第三句中提到了A项，在第四句提到了B项，在第五句提到了D项。只有C项不是REM睡眠的特点。
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