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

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

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问题                             Sleep
    Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. ______【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. ______【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, your brain activity level will increase again slightly. ______【49】Your eyes will begin to dart around under your closed eyelids as if you were looking at something occurring in front of you. ______【50】It is during 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. This is called stage 1 sleep.
B. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep.
C. The lower your stage of sleep, the slower your brain waves will be.
D. In stage 4 sleep people tend to dream.
E. If you are an average sleeper, your sleep cycle is as follows.
F. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves.
选项
答案C
解析 睡眠越深入, 脑电波就越缓慢。接下来两句话说：大约在开始睡眠后的40到60分钟, 你将进入沉睡状态。这时脑电波表现为巨大的缓波, 被称为δ节奏。可以看出沉睡和脑电波的缓波为正比发生的, 因此选C。
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