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15. ________of the land in that district ________ covered with trees and grass.
A. Two fifth; is B. Two fifths; is C. Two fifth; are D. Two fifths; are
16. They are _______the new songs.
A. practised singing B. practising to sing
C. practising sing D. practising singing
17. This kind of cloth_____ soft and ______ well.
A. is felt; sells B. feels; is sold C. is felt; is sold D. feels; sells
18. ---- Have you _____ the invitation to the party?
---- Yes, I have. And I've ______ it.
A. accepted, received B. received, accepted
C. received, received D. accepted, accepted
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