根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
To extinguish (熄灭) different kinds of fires, several types of fire extinguishers have been invented. 71 Most portable (手提式的) kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.
Since fuel, oxygen (氧气) 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. 72 The cooling method is the most mon way to put out a fire.Water is the best cooling material because it is low in cost and easy to get.
73 This is usually done by covering the fire with sand, steam or some other things. A blanket may be used do cover a small fire.
A third method is called separation. 74
The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. 75 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.B
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(答案→)B
解析：
【小题1】B 根据下一句operate for less than a minute可知在火灾爆发的时候要立刻准备好灭火设备。
【小题2】F 根据下文可知这里谈论的是冷却法，F符合段意。
【小题3】E 根据本段下文可知采取的用沙土隔断氧气的方法，故E符合句意。
【小题4】G 上文提及is called separation是指把燃料和火分开，通过这种方式来灭火。
【小题5】D 根据下一句These materials usually help keep the fire on可知这里的材料应该是那些易燃的材料，故D的内容符合要求。