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16. be careful (not) to do sth 小心(不)做某事 be careful about 注意 be careful with 小心;
17. as with ....也一样 as to / for 至于;关于
18. think about 考虑 think of 想到，想起 think over 仔细考虑 think out 想出
19. go rafting 去漂流
20. unless = if not 除非...否则... You should not go rafting unless you know how to swim.(条件)
区分：until You must not get off the bus until it has stopped.(时间)
How are you getting to the airport? 现在进行时表示的将来
My plane leaves at seven this evening. 一般现在时表示时刻表的将来
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