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 （蒸氣）．
Clouds are made of water．They may be made of very small drops of water．They may also be made of snow crystals（結(jié)晶體）．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(chǎn) liquid         B．a(chǎn) 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（狀態(tài)）．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 根據(jù)全文內(nèi)容可知，講述了什么是水以及水的重要性；水對所有的生物都至關(guān)重要．

解答 21．B細(xì)節(jié)理解題． 根據(jù)第二段內(nèi)容：Water is found almost everywhere．可知水資源幾乎是隨處可見的．故選B．
22．A細(xì)節(jié)理解題． 根據(jù)最后一段：When it is a liquid，you can drink it．可知當(dāng)水是液體的時候，你可以喝．故選A．
23．C細(xì)節(jié)理解題． 根據(jù)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 （結(jié)晶體）．可知云是被水汽凝結(jié)的水滴或者雪的晶體組成的．故選C．
24．D細(xì)節(jié)理解題． 根據(jù)最后一段：Water may be a solid or a liquid or a gas．可知水是固體、液體也是氣體．故選D．

點(diǎn)評 本文是科教類閱讀理解．做這類題材閱讀理解時要求考生對文章通讀一遍，做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進(jìn)行仔細(xì)分析，結(jié)合選項(xiàng)選出正確答案．推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案，切忌胡亂猜測，一定要做到有理有據(jù)

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