美国人每天要用4 500亿加仑的水。这些量的水可以让纽约城淹没在96英尺深的水中。我们应该记住,在地球上的水并不是取之不尽的。

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问题  
Sentence No. 1 Sydney is an important commercial, industrial and tourist centre on the south-east coast of Australia. It is Australia’s largest city with a population of more than three million.
Sentence No. 5 Every day, Americans use 450 billion gallons of water. Such amount would cover New York City to a depth of 96 feet. We must remember that water is not inexhaustible on earth.

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答案美国人每天要用4 500亿加仑的水。这些量的水可以让纽约城淹没在96英尺深的水中。我们应该记住,在地球上的水并不是取之不尽的。

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