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(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.
15. serve v.
(1) 为……服务/工作 A slave serves his master.
(2) 接待(顾客) The shop assistant is serving a customer.
(3) 侍候吃饭，端(菜);供应(饭菜) Lunch is served now.
(4) serve as 充任(某职务)作……用 She served as a model for several painters. / This box will serve as / for a seat.
16. speed的用法
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