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A. Because even though you are not an adult， you must deal with adult problems.
B. Because even though you are an adult， you must deal with children's problems.
C. Because even though you are a teenager， you must do a lot of homework.
D. Because adults often make them feel stressed.
2. Families can add to the stress a teenager might experience ______.
A. by asking them to go to university
B. by helping them with their homework
C. as teenagers quarrel with their parents， and their brothers or sisters
D. as families never support their children enough
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