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The following are some facts and figures about the closing ceremony of the Beijing Olympic Games， held here on Sunday night.
THE VENUE
The closing ceremony is held in the National Stadium， also known as the Bird‘s Nest， in the Olympic Green in northern Beijing.
The stadium was jointly designed by Herzog & de Meuron Design Office， and China Architecture Design & Research Group and ARUP. Its construction began on December 24， 2003， and completed on June 30， 2008.
The stadium’s seating capacity is 91，000， including 11，000 temporary seats. The floor space is 258，000 square meters.
MEMORY TOWER
The tower， consisting of five stories of elevation structure， is stretchable. Its maximum height is 20.7 meters and maximum load is 20 tons.
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