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12. Please have all the figures ________ to see how much they _________.
A. add; add up B. added to; add up C. add up; add up to D. added up; add up to
13. My sister _____ the League last month and she decided to _____ activities to help the old in town next week.
A. joined; join in B. joined in; join C. joined; join D. joined in; join in
14. Having failed the exam, the little girl _____ go home.
A. dares not to B. dares not C. dare not to D. dare not
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