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  3. When you first drift off into slumber, your eyes will roll about a bit, your

When you first drift off into slumber, your eyes will roll about a bit, your

游客2023-12-25  7
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.  [br] The lower your stage of sleep, ________.
选项 A、the faster your eyes will roll about
B、the quieter your breath will become
C、the slower your brain waves will be
D、the higher your temperature will be
答案 C
解析 题目问睡眠的深入会带来的变化。根据题干定位至第1段第5句。该句提到，随着睡眠的深入，the slower your brain waves will be “脑电波就越缓慢”，因此C项正确。A项“你的眼睛转动得越快”、B项“你的呼吸就会变得越安静”和D项“你的体温就会越高”在文中均未被提及。
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