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26. The scientist has had a research weather for more than 30 years.
A. in B. on C. at D. from
27. Seeing believing.
A. be B. are C. was D. is
28. Mum, I’m hungry now I didn’t have breakfast this morning.
A. because B. because of C. and D. but
29. —Do you spend a lot of time computer?
—No, but I spend much t ime doing my homework.
A. on; in B. in; on C. on; on D. in; in
30. —Is your father a teacher?
—Well, he _______.
A. used to B. was used to C. used to be D. is used to be
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