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In the first place， television is not only a convenient source of entertainment， but also a comparatively cheap one. With a TV set in the family people don't have to pay for expensive seats at the theatre， the cinema， or the opera .All they have to so is to push a button or turn a knob， and they can see plays， films， operas and shows of every kind. Some people， however， think that this is where the danger lies. The television viewers need do nothing. He does not even have to use his legs if the has a remote control. He makes no choice and exercises， no judgment. He is completely passive and has everything presented to him without any effort in his part.
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