根据短文内容，选择正确答案。
    The sun, the moon and the stars are all in the sky. The earth moves round the sun. And the moon moves around the earth.
    The sun is much bigger than the moon. It gives us light and heat. When our part of the earth turns to the sun, it is day. When our part of the earth turns away from the sun, it is night.
    The moon is our nearest neighbor in space. Sometimes it looks quite bright, but it doesn't give any light at all. The light on the moon comes from the sun, and it only reflects (反射) the light of the sun.