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11. replace v. 1) to put sth. back where it was; 2) to take the place of sb. \ sth; 3) to change one thing for another that is newer or better.
The brakes have to be replaced.
Electric lights have replaced candles.
You will have to replace those old computers.
12. prize 1) n. sth. of value given to someone who is successful in a game, race, or given for some action that is admired;
2) adj. a) [only before a noun] that has gained a prize
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