2. 外语
  3. Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too【B1】______in cycles.

Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too【B1】______in cycles.

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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【B1】______in cycles. If you are an【B2】______sleeper, your sleep cycle is as follows. When you first fall into slumber (安睡), your eyes will【B3】______about a bit, your temperature will drop【B4】______, your muscles will relax, and your breathing is slow and becomes quite【B5】______. Your brain waves slow down a bit too. This is called stage one sleep. For the next half hour or se, as you relax more and more, you will【B6】______down through stage two and stage three sleep. The lower your stage of sleep, the slower your brain waves will be. Then about 40 to 60 minutes after you lose【B7】______you will have reached the【B8】______sleep of all. This is stage four sleep.【B9】______but instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly.【B10】______This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep period that【B11】______.
【B8】
选项
答案deepest
解析 前面说进入探层睡眠，这是第四个步骤．
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大学英语四级

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