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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.  
The phrase extensive muscular inhibition means________.
选项 A、the body is incapable of movement
B、the muscles in the body are relaxed
C、voluntary muscles are capable of movement
D、the brain shows rapid burst of neural activity
答案A
解析 题目问extensive muscular-inhibition的意思。第2段倒数第3句提到，进入快速眼动睡眠状态时，身体大部分的随意肌都瘫痪了，无法活动，第2段倒数第2句提到，在快速眼动睡眠状态下，你的身体无法活动，由此可推断，extensive muscular inhibition表示“身体无法活动”，因此A项正确。B项“身体肌肉处于放松状态”、C项“随意肌可以移动”和D项“大脑神经活动的快速爆发”均与语境不符，可排除。
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