[audioFiles]2016m4x/audio_ezfj_023_20164[/audioFiles]

游客2023-11-02  22

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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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