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10. useless adj. not of any use This knife is so blunt. It’s useless.
I realized it was useless to reason with him.
I was useless at maths. = My maths is very poor.
11. shock 1) n. a) [C, U] a violent force from sth such as explosion, a crash or a hard blow b) [C, U] the feeling you get after sth unexpected and usually very unpleasant has suddenly happened, or you have received an unexpected piece of news c) the poor medical condition of someone who has an accident and whose heart and lungs are not working properly 2) v. to make someone feel very upset, angry, or unpleasant Earthquake shocks are often felt in Japan.
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