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Did you know that the use of soap to wash the body is quite a relatively recent thing?你知道时兴用肥皂洗澡并不太久吗？
No. What did they use before?不知道。以前人们用什么呢？
Powders and perfumes, I suppose.我想是用粉和香料。
But people didn’t used to wash as much as we do today.但是人们不像现在这样常洗。
If you think about it, baths and showers were not used much until 100 years or so ago, or perhaps even less.请你想一想，沐浴和洗澡，是近百年左右或者更近一点才比较普遍。
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