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The sky usually looks light blue. But if you went to the top of the highest mountain， went to the top of the highest mountain， where there is less air between you and the sun to scatter the sunlight， the sky would be deep， dark blue. And if you rode in a rocket high above the earth， where there is no air at all to scatter the sunlight， the sky would be so dark that it would be black. Sometimes the sky doesn't look blue. At sunrise and sunset， the light from the sun sometimes is scattered in such a way that you see red， orange， and other colors in the sky. 65. The sky usually looks light blue because _____. A. the sun is light and blue B. the air is light and blue C. the air scatters the sunlight D. the sunlight is blue 66. The sky looks dark blue when _____. A. there is less air between you and the sun B. there is high mountain C. the mountain is highest D. you climb a mountain
67. The sky looks black if ______.
A. you ride in a rocket
B. the rocket is
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