the sky usually looks blue.but if you went to the top of the highest mountain（阅读理解）

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• the sky usually looks blue.but if you went to the top of the highest mountain（阅读理解）
• 阅读短文,选择正确答案.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 lig
• the sky usually looks blue.but if you went to the top of the highest mountain（阅读理解）
• 若向量a=(x-2,y),b=(x+2,y).且绝对值a+绝对值b=8求点M(x,y)的轨迹C的方程
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