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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Unit4 Earthquakes Word usage： 1.shake 1)v. (shook, shaken) to (cause to) move up and down or from side to side with quick short movements. 2) n. [C usually sing.] an act of shaking The house shook when the earthquake started.
6.thousands of 基数词 s，并不表示确切的具体数字，可以单独使用，也可以先接介词of再接复数名词。There are thousands of people in the park on May Day. Thousands of people died of hunger. Mr. Smith gave thousands of books to the school. 注意：tens of thousands of 数以百万计的 hundreds of hundreds of 成百上千的 hundreds of thousands of 数十万的 millions of 数百万的
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