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Man is now facing a big problem ______which is becoming more and more serious.
8.……已成为人的关注的热门话题，特别是在年青人当中，将引发激烈的辩论。
______ has become a hot topic among people，especially among the young and heated debates are right on their way.
9.……在我们的日常生活中起着越来越重要的作用，它给我们带来了许多好处，但同时也引发一些严重的问题。
______ has been playing an increasingly important role in our day-to-day life.it has brought us a lot of benefits but has created some serious problems as well.
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