阅读理解

　　Water is the“life”of our earth.It is in every living thing.It is in the air.It runs through mountains and valleys.It forms lakes and oceans.Water is everywhere.

　　Nature has a great water system(系统).Rainwater finds its way to streams(溪)and rivers.Rivers lead to the ocean.At mouths of rivers,fresh water joins the salt water of the ocean.

　　Thick water steam in the air becomes clouds and clouds bring us rain.Plants and animals'life depends on water.Where there is water,there is life.We have to clean our streams and rivers and do something against pollution(污染)because pollution does harm to the life.

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完形填空

　　Water is the 　　1　　 of all the things we eat and drink．Not many people understand this but 　　2　　 quite true．The human body can go without 　　3　　 for a long time．We’ve got many examples for this．Yet two 　　4　　 three days without water can usually make people 　　5　　．Man can’t live 　　6　　 water．

　　Many people don’t understand how 　　7　　 water the human body needs 　　8　　 work well, and many people, especially young people, do not drink enough, 　　9　　 in very hot weather．Our body has mostly water, about 65％ to 75％．That is to say about two thirds of our body is water．When we do sports, some of the water will get away from our body．　　10　　 we don’t drink some water, we won’t have enough water．And if we don’t have enough water, we’ll feel tired and many of us will get ill．So you know how important water is to us．

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完形填空：

　　Of all the things we eat and 　　1　　, water is the 　　2　　 important．Not 　　3　　 people understand this, but it's quite true．The human body can go without food for a long time, but two 　　4　　 three days without water we will 　　5　　．

　　Many people do not understand how 　　6　　 water the human body needs to work properly(适当地)and many people drink 　　7　　, especially in hot weather．Most people drink 　　8　　 they are thirsty, but in fact we often need more water, especially if we have been taking exercise．

　　A man's body is about 70％water, if we do not have 　　9　　 water, we feel 　　10　　 and may become ill．

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