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 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 thing 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.

　　91. On the part of an average sleeper, there ____ of sleep in cycles.

　　A. is one stage B. are two stages

　　C. are six stages D. are four stages

　　92. When a person falls into the state of sleep, his ____.

　　eyeballs will roll about a bit

　　mind will relax more and more

　　breathing will slow for minutes

　　temperature will increase slightly

　　93. The lower your stage of sleep, ____.

　　the faster your eyes will roll about

　　the quieter your breath will become

　　the slower your brain waves will be

　　the higher your temperature will be

　　94. After you have reached the deepest sleep, ____.

　　you will stay at the fourth stage the rest of the night

　　you will lose your consciousness for 40-60 minutes

　　your brain waves will show the delta rhythm

　　your brain waves will show the alpha rhythm

　　95. In the REM sleep, ____.

　　the delta rhythm will disappear

　　the activity pattern will appear

　　something will occur in front of you

　　your eyes will begin to dart around

　　96. You will fall into the fourth stage of sleep ____.

　　about 80 minutes after you fall into slumber

　　some 10 minutes after you fall into REM sleep

　　about 40 minutes after you lose consciousness

　　some 30 minutes after you brain waves slow

　　97. The first paragraph of this passage tells us about ____.

　　A. the rhythms of brain waves B. the daily activities of sleep

　　C. the stages of sleep in cycles D. the daily activities in cycles

　　98. In this passage, the word “paralyzed” means unable to ____.

　　A. move B. think C. work D. speak

　　99. The phrase “extensive muscular inhibition” means ____.

　　the body is incapable of movement

　　the muscles in the body are relaxed

　　voluntary muscles are capable of movement

　　the brain shows rapid burst of neural activity

　　100. The best title for this passage would be ____.

　　A. Brain Waves B. Sleep Cycles C. Daily Activities D. Body Activities

　　参考答案：

　　91. D 92. A 93. C 94. C 95. D 96. C 97. C 98. A 99. A 100. B