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    12．Water is very important to living things．Without water there can be no life on the earth．All animals and plants need water．Man also needs water．We need water to drink，to cook our food and to clean ourselves．Water is needed in offices，factories and schools．Water is needed everywhere．
    There is water in seas，rivers and lakes．Water is found almost everywhere．Even in the desert part of the world，there is some water in the air．You can not see or feel it when it is a part of the air．The water in the seas，rivers and lakes is a liquid，the water in the air is a gas，and we call it water vapour （蒸气）．
    Clouds are made of water．They may be made of very small drops of water．They may also be made of snow crystals（结晶体）．Snow crystals are very small crystals of ice．Ice is frozen water．It is a solid．There can be snow and ice everywhere in winter．
    Water may be a solid or a liquid or a gas．When it is a solid，it may be as hard as a stone．When it is a liquid，you can drink it．When it is a gas，you can not see or feel it．

    21．Where can we find water？B
    A．We can find water when it turns into vapour．
    B．Water can be found almost everywhere．
    C．We can see water in deserts here and there．
    D．Water is only in seas and rivers．
    22．We can drink water when it isA．
    A．a liquid         B．a solid        
    C．in the air       D．turned into ice
    23．Clouds are made ofC．
    A．seas，rivers and lakes                           
    B．blocks of ice
    C．very small drops of water or snow crystals      
    D．solid，liquid and gas
    24．Water has three states（状态）．They areD．
    A．ice，snow and air                                    
    B．solid，vapour，snow
    C．drops of water，blocks of ice and crystals of water  
    D．solid，liquid and gas．

    分析 根据全文内容可知，讲述了什么是水以及水的重要性；水对所有的生物都至关重要．

    解答 21．B细节理解题． 根据第二段内容：Water is found almost everywhere．可知水资源几乎是随处可见的．故选B．
    22．A细节理解题． 根据最后一段：When it is a liquid，you can drink it．可知当水是液体的时候，你可以喝．故选A．
    23．C细节理解题． 根据第三段：Clouds are made of water．They may be made of very small drops of water．They may also be made of snow crystals （结晶体）．可知云是被水汽凝结的水滴或者雪的晶体组成的．故选C．
    24．D细节理解题． 根据最后一段：Water may be a solid or a liquid or a gas．可知水是固体、液体也是气体．故选D．

    点评 本文是科教类阅读理解．做这类题材阅读理解时要求考生对文章通读一遍，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据

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