回答（49）题 查看材料A.The delta rhythm will disappear to
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回答（49）题 查看材料
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 1 5 minutes and is called REM sleep．
F.This is called stage l sleep．
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