2. 外语
  3. When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will r

When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will r

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问题     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 become quite regular. Your brain waves slow down a bit, with the alpha rhythm predominating for the first few minutes. This is the first stage of sleep. For the next 30 minutes or so, you will drift down through Stage 2 and Stage 3. The lower your stage of sleep, the slower your brain waves will be. About 40—60 minutes after you lose consciousness, you will reach the last stage. Your brain waves will show the delta rhythm.
    You may think that you stay at this deep stage all the rest of the night, but that turns out not to be the case. About 80 minutes after you fall into slumber, your activity cycle will increase 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. This period of Rapid Eye Movements lasts for 8—15 minutes and is called REM sleep. During both light and deep sleep, the muscles in your body are relaxed but capable of movement. As you slip into REM sleep, a very odd tiling occurs—most of the voluntary muscles in your body become paralyzed. Although your brain shows very rapid bursts of neural activity during REM sleep, your body is incapable of moving. REM sleep is accompanied by extensive muscular inhibition.  
After you have reached the deepest sleep, ________.
选项 A、you will stay at the fourth stage the rest of the night
B、you will lose your consciousness for 40—60 minutes
C、your brain waves will show the delta rhythm
D、your brain waves will show the alpha rhythm
答案C
解析 题目问进入最深度睡眠后的变化。文章第1段提到了睡眠的4个阶段，最后两句提到，大约在40到60分钟的无意识状态后，你会进入睡眠的最后一个阶段，也就是最深度的睡眠，这时脑电波会显示为delta rhythm “δ节奏”，因此C项正确。文中第2段第1句提到在进入最后一阶段睡眠后并不会在之后的整晚都停留在这个阶段，可排除A项。B项“会失去意识40到60分钟”是进入第4阶段前发生的事情，也可排除。D项“你的脑电波会显示出α节奏”是在入睡开始的几分钟会出现的情况，故也不选。
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