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.  
In the REM sleep, ________.
选项 A、the delta rhythm will disappear
B、the activity pattern will appear
C、something will occur in front of you
D、your eyes will begin to dart around
答案D
解析 题目问快速眼动(REM)睡眠状态的表现。根据REM sleep定位至第2段第5句。该句提到，快速眼动(REM)睡眠是指持续约8到15分钟的迅速的眼球运动状态，但该句只是快速眼动(REM)睡眠的定义，没有说明该阶段会有怎样的表现，又从该句开头的This period可以推断，这个阶段具体的表现会在前文被提及，上一句提到在REM睡眠状态，眼睛开始迅速转动，因此D项正确。A项“δ节奏消失”是进入快速眼动睡眠之前的变化，不是快速眼动睡眠状态下的表现，可排除。第2段第3句提到δ节奏会被脑电波的运动图形取代，B项“脑电波的运动图形会消失”与文章内容不符，可排除。C项“有些事情会发生在你面前”未被提及，可排除。
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