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I opened the box. There was a beautiful gold ring in it. So I went 11 to the police station.
“ 12 lost a ring?”I asked.
“Yes.”said a policeman,“A young man who came in this morning lost a ring, he lost it in London.”
He 13 the young man. A few minutes later, the man arrived.
“Yes, this is my ring.”he said,“How can I 14 you, sir? You see, I paid a lot of money for this ring and 15 I lost it on the train!”
After I told him the 16 of the coat, he said, “You haven’t been on the train, I haven’t been in the hotel, so how did my ring 17 in the coat?”
“Did 18 sit or stand next to you on the train?” asked the policeman.
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