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50 years ago, no one talked about acid rain.50年前，没人谈论酸雨。
Then we didn't really know the harm it was causing to the world.那时，我们没有真正了解它对世界的危害。
Today almost every adult and school child is aware of acid rain and its effects.现在，几乎所有成年人和学生都认识到酸雨及其危害性。
It affects people all around the world.它对全世界的人都有影响。
Even those who are not responsible for its creation suffer from it.即使那些与其产生无关的人，也被其所累。
一站式课程咨询服务平台
