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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完形填空

　　When people think of tigers, they think：strong and dangerous (危险的)．But now, the big animal is calling for our help．

　　There were once eight kinds of 　　1　　 in the world, but three died out during the 20th century．In the last 70 years, the 　　2　　 of Siberian tigers (东北虎)has gone from as many as 300 to 　　3　　 22 somewhere．The Siberian tiger has been 　　4　　 dying (死亡)out completely．If the government doesn't make any efforts(努力), it's quite 　　5　　 that there will be no more Siberian tigers in China in ten to twenty years．

　　In order to double the number of wild tigers in the 　　6　　 ten years, the World Wildlife Fund (世界自然基金会)has started a program recently．It 　　7　　 save wild tigers and put an end to tiger hunting and killing．China, together with twelve other 　　8　　 , has joined in．

　　Wild animals, such as red deer and wild pigs, are the main 　　9　　 of tigers．The hunting of these animals is the greatest threat (危险)to tigers．So the most important thing is 　　10　　the animals that tigers eat．To protect the wild tigers, we need to call on more people to stop eating and hunting wild ani-mals．

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