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[audioFiles]2015m7s/audio_ezfj_013_20153[/audioFiles]

游客2023-11-05  70
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答案                             Movement of the Earth
    If you are traveling forwards in a train, the things around you outside seem to be moving backwards./The sun seems to rise in the east,/move across the sky,/and set in the west./In other words, the sun seems to travel round the earth./However, this is not really true./It is the earth that is turning on its own axis./The earth also travels round the sun on an unchanging path,/known as an orbit./There are seven other planets of different sizes,/which all turn round on their own axes/and which all travel round the sun./These are known as the solar system./The planet nearest the sun is Mercury, and the planet farthest from the sun is Neptune./The orbits of the earth and the other planets are not perfect circles. They are ovals./
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