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 balloon burst.
After ten days of rain the river burst its banks.
A burst of hand-clapping followed the ending of the song.
4. canal n. an artificial stretch of water dug in the ground to allow ships or boats to travel along it, or to bring water to or remove water from an area
Coal used to be sent here by canal.
Canals have been built to irrigate the desert.
The Panama Canal joins two oceans.
5.steam n. [U] 1) water in the state gas produced by boiling 2) power or effort produced by steam under pressure, and used for making things work or move Who invented the steam engine? Steam was used to be the power of a train.
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