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. ____ the meeting himself gave them a great deal of encouragement. (2003 上海)
A. The president will attend
B. The president to attend
C. The president attend
D. The president's attending
5. I don't think ____ possible to master a foreign language without much memory work. (NMET 1990)
A. this B. that C. its D. it
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