摘要: With 8. hardly 9. cheers 10. once 11. excitedly 12. Since (14) It seems to us that the earth stand quite still . But it is really m 1 all the time. It turns around a make-believe line t 2 its center. We call this make-believe line the earth's axis . The two e 3 of the earth's axis are called its poles (极). The earth travels twenty-four hours around its axis o 4 . We look at the sun and say it "travels" a 5 the sky, but the sun doesn't really do S 6 . The turning of the earth makes us f 7 as if the sun were moving across the sky. We can't see that the earth is moving because everything e 8 on the earth is turning with us. As the earth turns around every twenty-four hours, first one half f 9 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 a 10 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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