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  3. 共用题干 SleepSleep is part of a person\'s d

共用题干 SleepSleep is part of a person\'s d

书海库2019-12-17  5
问题 共用题干Sleep
Sleep is part of a person's daily activity cycle .There are several different stages of sleep,and they too occur in cycles.______(46)
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 slow and become quite regular. Your brain waves slow down a bit too,with the alpha rhythm of rather fast waves predominating for the first few minutes.______(47)
For the next half hour or so,as you relax more and more,you will drift down through stage 2 and stage 3 sleep.______(48)
Then about 40 to 60 minutes after you lose consciousness you will have reached the deepest sleep of all.Your brain waves will show the large slow waves that are known as the delta rhythm.
This is stage 4 sleep.You do not remain at this deep fourth stage all night long,but instead about 80 minutes after you fall into slumber,your brain activity level will increase again slightly. ______(49)
Your eyes will begin to dart around under your closed eyelids as if you were loo-king at something occurring in front of you.______(50)
It is during REM sleep period,your body will soon relax again,your breathing will grow slow and regular once more,and you will slip gently back from stage 1 to stage 4 sleep-only to rise once again to the surface of near consciousness some 80 minutes later.
选项 ______(46)A: The delta rhythm will disappear,to be replaced by the activity pattern of brain waves.B: If you are an average sleeper,your sleep cycle is as follows.C: In stage 4 sleep people tend to dream.D: The lower your stage of sleep,the slower your brain waves will be.E: This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep.F: This is called stage 1 sleep.
答案B
解析如果你是一个正常的睡眠者，你的睡眠循环会这样进行。本文以一个人的睡眠过程为例，说明睡眠的不同阶段和周期。从接下来的文章中看出以下就是描述睡眠的四个阶段和周期，因此这里选择B导入这个叙述。 这被称为第一阶段睡眠。根据接下来一句话：在随后约半小时内，你进一步放松，进入第二和第三阶段睡眠，可以推断该句之前描述的就是睡眠的第一阶段。 睡眠越深入，脑电波就越缓慢。接下来两句话说：大约在开始睡眠后的40～6O分钟，你将进入沉睡状态。这时脑电波表现为巨大的缓波，被称为δ节律。可以看出沉睡和脑电波的缓波为正比发生的，因此选D。 δ节律消失，并被脑电波的运动图形取代。该句前一句说：入睡后约80分钟左右，你的大脑运动水平会再度略有提高。δ节律被再次运动的脑电波图形取代，因此选A。 这种迅速的眼球运动持续约8～15分钟，这一阶段睡眠被称之为快速眼动（REM)睡眠。接下来一句说：在REM睡眠阶段，你的肢体会很快再度放松，呼吸也再次放慢并变得有节奏，你会轻松地从第一阶段滑入第四阶段睡眠——直到大约80分钟后重新接近清醒状态。这里的REM和前一句相衔接。
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