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Perhaps you’ve seen the English letters “WC” in your city. They show public toilets. But do
you know it is far from elegant (优雅的) English? In fact, foreigners from English-speaking countries rarely use the letters.
Workers in our city are changing “WC” signs all over the city. The government is spending much money changing all the bad English on signs and restaurant menus. Many other places in China are following our steps.
“WC, or water closet, is old-fashioned English. It sounds dirty to me,” says Charlie Shifflet, a young man from the US. The old sign will become “Gents/Men” and “Ladies/Women”.
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