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90.Many old customs are gradually ____.
A.died out B.dying out C.died away D.dying of
91.The tiger, a once ____ animal to humans, is now ____ of disappearing on the earth.
A.dangerous, danger B.dangerous, in danger
C.in danger, in danger D.danger, in danger
92.What he said ____ a big difference to the way of my thinking. ____, his words have a great effect on me.
A.makes, What is B.does; that is C.makes; That is D.makes; Which is
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