小学六年级英语：阅读理解天天练39-40
小学六年级英语：阅读理解天天练（39）
What is the sky? Where is it? How high is it? What lies above? They are difficult to answer, aren’t they?
Is the sky blue? The sky has no color. Is the sky full of air? We know that there is air around the world. When planes fly, they need air to lift their wings. Planes cannot fly very high because when they go higher, the air gets thinner. If we go far enough from the earth, we find there is no air.
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