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role n. 原因；理由
(1) (戏剧中的) 角色
Oliver played (acted) the role / part of Hamlet.
(2) (现实生活中的) 身份；作用
What is your role on the Committee?
(3) play a...role in... = play a...part in在……中扮演……角色或作用
The headmaster plays an important role / part in the good running of a school.
reason n. 原因；理由
(1) to do sth. You haven't any reason to leave me.
(2) for sth. / doing People must have a reason for saying such things.
(3) 从句；从句用why / for which引导 That is the reason why you should leave.
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