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,(46). When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, 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.(47). 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,(48). 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 long, but instead about 80 minutes after you fall into slumber,(49). 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.(50). 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.

A. your brain activity level will increase again slightly.
B. The slower your brain waves will be.
C. Your brain is still working when you are sleeping.
D. Your sleep cycle is as follows.
E. It is during REM sleep that most dreams seem to occur.
F. This is called stage i sleep.
选项
答案D
解析 意为：你的睡眠是这样循环的。
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