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When someone asked me what business I am in, my face feels 1 . I envy(嫉妒)people who can say that they are writers, bookkeepers and doctors. All these jobs speak for themselves.
I really do make a living by 2 , and a good one, too. I can laugh like a king or like a school boy. It is a skill that I have learned, 3 the skill of mending shoes. Whenever and however laughter is needed, I am asked to do 4 . I laugh like a bus driver or a shopkeeper. I laugh 5 , kindly and happily.
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