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9. The new suspension bridge _____by the end of last month.
A. has been designed B. had been designed
C. was designed D. would be designed
10. Nowadays, we students are from heavy school work and for the entrance examination.
A. suffering, preparing B. suffered, prepared
C. suffering, prepares D. suffers, preparing
11. Although we invited him to the party, Mr. Smith decided to another late night the computer room.
A. spend; in B. take; for
C. cost; on D. spend; on
12. The room _____smoke and I had to go out for some fresh air.
A. was filled of B. was full with
C. was filled with D. was full about
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