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9. clap 1) n. the action or sound of hands-clapping; a high-pitch noise of thunder
2) v. to strike together with hands They gave the speaker a clap.
A clap of thunder reverberated through the house. The audience clapped the pianist heartily.
10. roll 1) n. sth rolled up, such as paper; things with this shape; list of names
2) v. to move by turning over and over; to form into cylindrical or spherical shape; (of earth) to extend as in a wave; (to cause to) sound with long, vibrating tone; to sway
Please buy a roll of film for me.
The roll of thunder was deafening.
She rolled up her sleeves and began to prepare for supper.
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