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完形填空。
We know the moon is about 380,000 kilometres away from the earth．It is 1 moving．And it is moving round the earth day and night．It goes round once a 2 ,or to be exact(准确的),once 29 and a half days．
The moon looks smaller than the sun．It looks the 3 biggest in the sky．But in fact it is one of the smallest．It is 4 us,so it looks big．
Once 29 and a half days,the whole moon looks 5 and this is the part turning to the sun．The part turning away 6 the sun looks dark．From this we know the moon has no light of its own．The light 7 the sun．
But the dark part of the moon is not 8 ．Usually we can just see it．We see the old moon in the new moon's 9 ．The light making us see the old moon does not come from the sun, 10 from the earth．We all know water or 11 may reflect(反射)much of the sun's light．The whole earth reflects much of the sun's light to the 12 of the moon．So we can 13 the dark part of it．
14 there were any men on the moon,they would see our earth reflecting the light of the sun,again 15 a big mirror(镜子)in the sky．
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