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 man’s car had a flat tire(瘪胎). Although he had another tire，he had nothing to work with. I decided to 51 him. I changed the tire for him and allowed him to sit in my air-conditioned car while I did it. Fifteen minutes later，I 52 the work. I was hot and tired，but I really felt 53 after an act of kindness to the man who had earlier 54 my car run off the road.
You can really enjoy great 55 from kindness acts, so always lend your hands to others in trouble.
( )41. A. need B. school C. danger D. summer
( )42. A. walking B. riding C. running D. driving
( )43. A. fell B. jumped C. came D. climbed
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