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Happiness is like a pebble1 dropped into a pool to set in motion an ever-widening circle of ripples2. As Stevenson has said, "Being happy is a duty."
There is no exact definition of the word happiness. Happy people are happy for all sorts of reasons. The key is not wealth of physical well-being, since we find beggars, invalids and so-called failures who are extremely happy.
Being happy is a sort of unexpected dividend. But staying happy is an accomplishment, a triumph of soul and character. It is not selfish to strive for it. It is, indeed, a duty to ourselves and others.
Being unhappy is like an infectious disease. It causes people to shrink away from the sufferer. He soon finds himself alone, miserable and embittered. There is, however, a cure so simple as to seem, at first glance, ridiculous: if you don't feel happy, pretend to be!
一站式课程咨询服务平台
