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20.Which do you enjoy ______ your weekends ,fishing or watching TV?
A. spending B. to spend C. for spending D. spend
21. A modern city has been set up in ______ was a wasteland a few years ago.
A. which B. what C. that D. where
22. Every possible means _____ to work out the problem, but it is too difficult for us.
A. is used B. are used
C. has been used D. have been used
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