互動封閉仿真課堂
1、智能交互 2、電子板書式視頻教學 3、在線互動問答 4、封閉課堂啟發(fā)式教學方式
隨堂測試、知識梳理、易錯點揭示、總結啟迪智能錯題本
聽課中的錯題能自動加入錯題本，課后可方便復習及導出錯題本升級服務
在線答疑、課后同類題練習、講義下載、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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