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最佳答案：The oceans are the source of life on the earth.
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最佳答案：The water,you are Earth's blood.You,on the Earth have not had the life.The water
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最佳答案：many animals that used to live on the earth have disappeared
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最佳答案：We have imagined a lot of the world,but what we have is the only one waterful ea
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最佳答案：Fredric Brown's "Knock"published in Thrillering Wonder Stories 1948:"The last ma
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最佳答案：the existence of
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最佳答案：The last person on the earth is sitting in the room alone and someone knocks the
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最佳答案：The trouble is that he has never done the work.Looking into space from the earth
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最佳答案：We (are supposed to) commit ourselves to the undertaking of a more greener earth
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最佳答案：Solar eclipse is an astronomical phenomenon,only to run to the moon between the