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 stone statues of presidents were built at the suggestion of an historian in the State of Dakota，with a view to carrying forward the U. S. pioneering spirit everlastingly.
The statues are 18meters high. They are the highest and greatest realistic stone statues in the world，taller than a 6-storied building and larger than the Great Sphinx of Egypt. The size of each head is 20sq mt，with a 20-meter- long face，a 7-meter -long nose，a 2.6-meter- wide mouth and two 1.5-meter -wide eyes. Though not facing the same direction，they are all lifelike and look ahead gravely in harmony with fixed gazes. On clear days，one can have a sight of the four presidents with their firm and steady expression_r_r at a distance of dozens of kilometers.
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