互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
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升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒Read the following three texts. Answer the questions on each text by choosing A， B， C or D. Mark your answers on the ANSWER SHEET by drawing a thick line across the corresponding letter in the brackets.
Text 1
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 close
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