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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10. accept v: receive or say yes to an offer eg. He accepted the reward. She refused to accept his invitation. 11. position n: place or post of employment eg. I want to know the position of the shop. The guns are in position.
He has a high position in society.
Useful expressions：
1. lose heart eg. Don’t lose heart you still have many chances. Though he failed many times, he didn’t lose heart.
2. (be) in trouble : in a situation that involves danger, pain, worry, etc eg. When I am in trouble, I always ask him for help. If we can’t finish the job on time, we will be in a lot of trouble.
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