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、短信提醒例1
Tom Brenna was working in a Philadelphia office building when he noticed a black bag. The bag contained a book.
This chance discovery ended a 12-day search by the Library Company of Philadelphia for a historical treasure – a 120-page diary kept 190 years ago by Deborah Logan， “a woman who knew everybody in her day，” James Green， the librarian told the magazine American Libraries.
Most of the diary is a record of big events in Philadelphia. It is also includes a description of British soldiers burning Washington， D.C. in the war of 1812. She describes President James Madison on horseback as “perfectly shaking with fear” during the troubled days. George Washington， she writes， mistook her for the wife of a French man， and praised her excellent English.
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