新东方四六级写作考试背诵范文精选（49）

2009-04-14 00:00:00 · 作者：编辑部

新东方英语四六级作文栏目：为您提供2021年12月大学英语四级作文范文、英语四级作文模板万能句型、英语四级作文题目、英语四级作文常用句型、英语四级作文万能句子等相关信息供大家参考学习。

·应急小贴士：四六级写作词汇量不足怎么办
·09年6月四六级考前必看范文
·六级作文高分技巧：精彩你的“强调”
·免费试听新东方在线四六级名师辅导课程

49 Sleep

·2009年6月四六级考前必看范文

Sleet 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 fist drift off into slumber, your eyes will roll about a bit, you temperature will drop slightly, your muscles will relax, and your breathing well slow and become quite regular. Your brain waves slow and become quite regular. Your brain waves slow down a bit too, with the alpha rhythm of rather fast waves 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. slower your brain waves will be. Then about 40to 69 minutes after you lose consciousness you will have reached the deepest sleep of all. Your brain will show the large slow waves that are known as the delta rhythm. This is stage 4 sleep.

·四六级考试学习资料汇总第1辑
·四六级考试学习资料汇总第2辑
·四六级考试学习资料汇总第3辑

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. 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 as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep period, your body will soon relax again, your breathing 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.

相关阅读：
·女生包揽“四级明星寝室” 学英语有性别差异？
·校内书店跨校代报四六级校方申明成绩无效
·部分省市高校四六级考试报名截止严禁跨省跨校报考

【本文为找大学网转载，文章版权归原作者及原出处所有。文章系作者个人观点，不代表大学生在线立场，转载请联系原作者及原出处获得授权。有任何疑问都请联系（kf@zhaodaxue.cn）】