高三英语同步课程
《完形填空之词语辨析》麻雪玲
点击试听好老师
老师传授典型题详细办法
教学生举一反三
一题多解、一题巧解
错题本
错题追踪复习
听课中的错题能自动加入错题本
课后可方便复习及导出错题本
网络答疑
课程互动性强
互动问答
数理化英快速答疑
课后练习
经典例题课后练习
老师针对课堂中的经典例题
为学生推送同类型题，掌握解题方法
After a busy day of work and play， the body needs to rest. Sleep is necessary for good health. During this time， the body recovers from the activities of the previous day. The rest that you get while sleeping enables your body to prepare itself for the next day.
There are four levels of sleep， each being a little deeper than the one before. As you sleep， your muscles relax little by little. Your heart beats more slowly， and your brain slows down. After you reach the fourth level， your body shifts back and forth from one level of sleep to the other.
Although your mind slows down， from time to time you will dream. Scientists who study sleep state that when dreaming occurs， your eyeballs begin to move more quickly （Although your eyelids are closed）。 This stage of sleep is called REM， which stands for rapid eye movement.
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