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7. It’s never too late to learn. 活到老，学到老。
8. Then, later that afternoon, another big quake which was almost as strong as the first
one shook Tangshan.
9. Workers built shelters for survivors whose homes had been destroyed.
10. The army organized teams to dig out those who were trapped and to bury the dead.
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