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福建省九年级复习英语阅读理解练习试卷
What is the sky? Where is it? How high is it? What is above it? These questions are hard to answer, aren’t they?
Is the sky blue? The sky has no colour. We know that there is air around the world. When planes fly, they need air to lift their wings(机翼). Planes can’t fly very high because when they fly higher, the air gets thinner. If we go up about 12000 kilometres from the earth(地球), we find there is no air.
What is the sky? Where is it? How high is it? What is above it? These questions are hard to answer, aren’t they?
Is the sky blue? The sky has no colour. We know that there is air around the world. When planes fly, they need air to lift their wings(机翼). Planes can’t fly very high because when they fly higher, the air gets thinner. If we go up about 12000 kilometres from the earth(地球), we find there is no air.
