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4. Which of the following is considered impolite in Britain?
A. Buy small presents when invited. B. Refuse the invitation without telling anyone.
C. Write a thank-you note after a visit. D. Give a telephone call after a visit.
5. Where would you probably see this passage?
A. In an invitation. B. In a guidebook. C. On a poster. D. In a newspaper.
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