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1. That empty hole is like a mouth always needing to be fed.
2. I cheered up immediately … watching the earth become smaller….
3. We watched, amazed as the fire broke out on the outside of the spaceship.
4. This disappearance made possible the rise of mammals on the earth.
This produced a chain reaction, which made it possible for life to develop.
5. …. The earth may become too hot to live on.
6. They are putting too much carbon dioxide into the atmosphere, which prevent heat from escaping the earth into space.
7. So whether life will continue on the earth for the millions of year to come will depend on whether this problem can be solved.It was not clear whether the shape would last or not.
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