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) call for
① 来找(某人)；来取(某物) I'll call for you at your house.
②要求；需要Success in school calls for much hard work.
(2) call on
① call on / upon sb. 拜访；去会(某人) I hope to call on you at your office at 3 o’clock today.
② call on / upon sb. to do sth. 请／叫某人做某事He called upon me to speak immediately.
③ 号召；呼吁；要求 The President called on his people to serve the country.
(3) call up
① 给……打电话 (英 ring up) I tried to call you up last night, but no one answered the phone.
② 征召入役；调用 (后备部队) Three boys in our street were called up last week.
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