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remained in the car. We informed him that the fissure extended for fifty yards and was two feet wide and four feet deep. Even this had no effect. Bruce engaged low gear and drove at a terrifying speed, keeping the front wheels astride the crack as he followed its zig-zag course. Before we had time to worry about what might happen, we were back on the plain again. Bruce consulted the map once more and told us that the village was now only fifteen miles away. Our next obstacle was a shallow pool of water about half a mile across. Bruce charged at it, but in the middle, the car came to a grinding halt. A yellow light on the dash- board flashed angrily and Bruce cheerfully announced that there was no oil in the engine!
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