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、–This is Jane speaking.
--Oh, it’s you. Your voice sounds quite different _________ by the phone.
A. for B from C. by D. on
17、He spends a lot of time ________ the TV set.
A. in watching B. on C. in front of D. on watching
18、_________ to secret papers is restricted to senior management.
A. Means B. Acceptance C. Access D. Advice
答案：AABCC BBCAB ACADD DCC
综合型单选专练
1、Helen had to shout ____ a high voice ____ in the waiting room.
A. at; making herself hear B. in; to make herself hearC. in; making herself heard D. in; to make herself heard
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