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1. The rich_____ not always happy.
A. is B. are C. has D. have
2. About_______ of workers in that steel works are young people.
A. third-fifths B. three-fifthsC. three-fivesD. three-fifth
3. I’ve told him____________.
A. a hundred timeB. hundred timesC. hundred of times D. hundreds of times
4. His parents wouldn’t let him marry anyone ________ family was poor.
A. of whom B. whom C. of whose D. whose
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