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There are about 11 million things for sale on eBay at one time.Many people buy and sell special things that they collect,like toy trains or dolls.Some of these things become very valuable over the years.For example,a woman in Florida has collected the toys called Barbie dolls since she was a little girl.She knows which ones are valuable because they are rare.Recently she bought one doll for a few dollars at someone’s yard sale.She later sold it for several hundred dollars on eBay.
Some things on eBay sell for only a few dollars.Others sell for many thousands of dollars,such as old cars or rare money collections.Some Americans have started their own business selling things on eBay.More than 100 000 businesses now operate only on eBay.
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