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1. afford
(1) (和can，could，be able to连用) 有 (时间、经济等) 条件(做某事) to do
We can't afford to pay such a price.
afford n. / pron. (出得起;买得起等)
They donot consider whether they can afford it or not.
(2) 经得起 (做某事或发生某事) (多 to do)
He could not afford to lose his fortune entirely.
2. apologize的用法
▲ 构词：apology n. 辩解，道歉
▲ 搭配：
① apologize to sb for (doing) sth = make an apology的 sb for (doing) sth向某人为某事(为做了某事)道歉
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