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阅读理解
It seems to us that the earth stands quite still(静止的)．But it is really moving all the time．It turns around a make-believe line through its center．We call this make-believe line the earth’s axis(地轴)．The two ends of the earth’s axis are called its poles(极)．The earth travels twenty-four hours around its axis once．
We look at the sun and say it “travels” across the sky, but the sun doesn’t really do so．The turning of the earth makes us feel as if the sun were moving across the sky．We can’t see that the earth is moving because everything else on the earth is turning with us．As the earth turns around every twenty-four hours, first one half faces the sun and then the other half．When our half of the earth is facing the sun, we say it is “day”．When our half is away from the sun, we say it is “night”．It is the turning of the earth that tells us when to go to bed and when to get up．
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