Sleep is part of a person’s daily (11) cycle. There are several different stages of sleep, and they too occur in cycles. If yo

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问题 Sleep is part of a person’s daily  (11)  cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you fist drift off into slumber, your eyes will roll about a bit, you temperature will drop slightly, your muscles  (12)  and your breathing will slow and become quite regular.  (13)  waves slow down a bit too, with the alpha rhythm of rather fast waves pre~ dominating for the first few minutes. This is called stage I sleep. For the next half hour or so, as you relax  (14)  , you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep is,  (15)  your brain waves will be.
  
Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you first drift off into slumber, your eyes will roll about a bit, you 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. This is called stage 1 sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep is, the slower your brain waves will be.

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答案will relax

解析 此处应该有一个动词/动词词组做谓语。your muscles will relax理解为“你的肌肉将得到放松”
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