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crash: fall or strike sth. Suddenly and noisily
land: reach the ground after a jump or fall
deserted: with no one present
challenge: difficult, demanding task
realize: be fully aware (明白的) of or accept sth. as a fact; understand
suppose: accept as true or probable; believe; imagine
parachute: device for making people or objects fall slowly and safely when dropped from a plane
pal: friend
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