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The first secret of happiness is to enjoy the simple things in life. Too often，we spend so much time thinking about the future，for example，getting into college or getting a good job，that we don't enjoy the present. You should enjoy life's simple pleasures，such as reading a good book，listening to your favorite music，or spending time with close friends. People who have close friends usually enjoy happier and healthier lives.
The second secret of happiness is to be active. Many people go dancing or play sports. People can forget about their problems and only think about the activities.
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