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2. His rage was soon calmed down by the rustic peace. 乡村的宁静很快就使他的怒气平静下来。
3. I told myself to calm down. 我告诫自己要冷静下来。
have got to
conj. 不得不(必须)
1. You may not like him, but you have got to admire his persistence.
你可以不喜欢他，但你不得不佩服他那种坚忍不拔的精神。
2. I couldn't have got to the meeting on time -- unless I had caught an earlier train.
我不可能及时赶到会场，除非我赶上了较找的一班火车。
3. Jim broke away from his friends, saying "I have got to hit the books."
吉姆离开他的朋友时，说道：“我得回去做功课了。”
concern
n. 关心,关系, 关切的事,忧虑
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