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1.) People all over the world have been making paper for two thousand years.
2) As a result of the invention of paper, the Chinese people could know a lot about the history in other parts of the world.
3) As there was no paper, much of the history over hundreds of years is completely unknown in many parts of the world.
4) Before writing was developed, people in China had no way to keep records.
5) From the text we know that writing was developed in the third century BC.
6) Books of pieces of bamboo or wood tied together were difficult to read and heavy to carry.
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