Since fuel, oxygen and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire.　2　The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.  

　　　3　This is usually done by covering the fire with sand, steam or some other things. A blanket may be used to cover a small fire. 

　　A third method is called separation. 　4　 

　　The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes.　5　These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water. 

　　A.Fire extinguishers should be available everywhere in our life.

　　B.They must be ready for immediate use when fire breaks out.

　　C.Where a fire breaks out, there will surely be unavoidable damage.

　　D.Fires in wood, paper, cloth and the like are called Class A fires.

　　E.Another method of extinguishing fire is by cutting off the oxygen.

　　F.If the heat is reduced by cooling the material below a certain temperature, the fire goes out.

　　G.It includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.

　　Ⅲ.书面表达

　　以“Smoking Is Harmful”为题,写一篇100词左右的短文,内容包括以下要点:

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