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( = She was too angry to say a word. ) 她气得一句话都说不出来。
so 形容词 a / an 名词 that从句，如：
He is so clever a boy that everyone likes him. 他如此聪明，大家都喜欢他。
He is such a clever boy that everyone likes him.
It was such terrible weather that we had to stay at home all day.天气如此恶劣，我们只好整天呆在家里。
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