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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.  
When a person falls into the state of sleep, ________.
选项 A、his eyeballs will roll about a bit
B、his mind will relax more and more
C、his breathing will slow for minutes
D、his temperature will increase slightly
答案A
解析 题目问一个人进入睡眠状态时的变化。第1段第1句提到，开始昏昏入睡时，眼球会滚动几下，因此A项正确。第1段第1句提到，开始昏昏入睡时体温会略有下降，肌肉放松，呼吸变得有节奏，因此C项 “呼吸会变慢几分钟”和D项“体温会略有上升”错误，可排除。B项“头脑变得越来越放松”未被提及，可排除。
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