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6. The greater the population there is in a locality, the greater the need there is for water, transportation, and disposal of refuse.
6.一个地方的人口越多，其对水，交通和垃圾处理的需求就会越大。
7. It is more difficult to write simply, directly, and effectively than to employ flowery but vague expressions that only obscure one’s meaning.
7.简明，直接，有力的写作难于花哨，含混而意义模糊的表达。
8. With modern offices becoming more mechanized, designers are attempting to personalize them with warmer, less severe interiors.
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