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  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.  
You will fall into the fourth stage of sleep________.
选项 A、about 80 minutes after you fall into slumber
B、some 10 minutes after your fall into REM sleep
C、about 40 minutes after you lose consciousness
D、some 30 minutes after your brain waves slow
答案C
解析 题目问进入第4阶段的时间。第1段倒数第2句提到，大约在失去意识40到60分钟后，会进入睡眠的最后一个阶段，此处的“最后一个阶段”即“第4阶段”，因此C项正确。A项“入睡后约80分钟”不属于40到60分钟的时间范围，可排除。B项“进入快速眼动睡眠后10分钟左右”在文中未被提及。D项“在你的脑电波变慢大约30分钟后”在文中第1段提到这是进入第2和第3阶段睡眠的时间准备，可排除。
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