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(B)
Many people like to travel by plane, but I don't. An airport is usually far from the city. You have to get there early and wait for hours for the plane to take off and it's often late. You can't open the windows. You can't choose the food. Planes are fast, but it still takes hours to get out of the airport and into the city.
I like traveling by train I think trains are safe. Railway stations are usually in cities. When you are late for a train, you can catch another one. You can walk around in the train and open the windows. You can see many interesting things on your way. I know it takes a little more time.
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