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 electricity supply must be turned off at the mains before you change the lighting circuit. 在改变火线前，主干线的电力供应必须切断。 Mrs Garey as usual went to the door to see him off. Garey夫人像通常一样把他送到门口。He had to put off an appointment with me on account of illness. 因为疾病的缘故，他不得不推迟了与我的约会。Before the body of the car can be properly repaired, all the external fittings must be taken off. 车身适当修理前，所有外部的配件必须拿下来。The fire doesn't seem to be giving off much heat. 这炉火好像不大热。
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