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68. Sometimes the sky doesn't look blue because ______.
A. the sun is rising B. the sun is setting
C. the air has different colors
D. the light from the sun is scattered in a different way
69. A good title for this passage would be _______.
A. The Sky Looks Blue
B. Why the Sky Looks Colorful
C. The Beautiful Sunlight
D. Something About the Air
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