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. “Is there any particular dessert you would like have?” “_____ you select is all right with me .”
A. Whatever B. Which C. That D. Whichever
17. _______ some mammals came to live in the sea is not known.
A. That B. What C. How D. Since
18. _______is his own decision.
A. When he is leaving B. When he leaves
C. When does he leave D. He leaves
19. The people at the party were worried about Janet because no one was aware ________ she had gone.
A. of where B. of the place C. the place D. the place where
20. ________ is of no concern to us.
A. It rain or not B. If or not it rains
C. Whether it rains or not D. Will it rain or not
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