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Then，in the spring of 1858，John got sick and died.He was buried in a cemetery in Edinburgh，Scotland.After John was buried，Bobby stood at John’s grave and cried.“Come on，Bobby，”friends said.“It’s time to go home.”Bobby went home，but later he returned to the cemetery.He sat down near John’s grave.He stayed there all night.
Bobby stayed at the cemetery the next day，and the next day，and the next.For the next 14 years，Bobby never left the cemetery.When the weather was cold or rainy，he slept in a small house at the cemetery.When the weather was warm，he slept on the ground near John’s grave.
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