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6. take off, take down, take in, take on, take up
(1) take off
① (飞机)起飞 A helicopter is able to take off and land straight up or down.
② 脱下(衣裳等);取下 He took off his wet shoes. / Who took the knob off the door?
③ 休假;请假;歇工 When his wife was sick he took off from work.
④ (指观念、产品) 大受欢迎;(事业)突然发达，成功The new type of cell phones has really taken off. / His business began to take off when he was in his forties.
(2) take down
① 拿下来;取下来 He reached up to the third shelf of the bookcase and took down a dictionary.
② 记下来 He read out the names and his secretary took them down.
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