【題目】To extinguish (熄滅) different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. 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 (氧氣) 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. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. 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.

Another method of extinguishing fire is by cutting off the oxygen. 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, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.

The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.

【1】If a fire breaks out on a bus, which of the followshould be ready there for you to use?

A.Sand B.Water C.A blanket. D.An extinguisher.

【 小題2】 To cover a small piece of burning wood with a basin in order to stop the fire is an example of _______.

A.separating the fire B.reducing the heat

C.removing the fuel D.cutting off the oxygen

【3】In choosing how to put out a fire, we should first be clear about_______.

A.when it breaks out B.how it comes about

C.what kind it is D.where it takes place

【4】What would the author probably discuss in the paragraph that follows?

A.Another class of fires

B.Another type of extinguishers

C.How fires break out.

D.How fires can be prevented.

【答案】

【1】D

【2】A

【3】D

【3】B

【解析】

試題分析: 本文用滅火器的用途作為引子，引出滅火的一些其他方法。

【1】D；細(xì)節(jié)理解題。根據(jù)第一段最后一句，可知現(xiàn)行法律強(qiáng)制公交，輪船，火車，飛機(jī)安裝滅火器。故選D。

【2】D；細(xì)節(jié)理解題。根據(jù)第三段的內(nèi)容，可知還有一種滅火的方法就是隔絕氧氣，而用臉盆蓋住火焰剛剛好隔絕活與氧氣。故選D。

【3】C；細(xì)節(jié)理解題。根據(jù)The method that is used to put out a fire depends upon the type of fire.說(shuō)明滅火的方法取決于火的種類。故選C。

【3】A；判斷推理題。文章的最后一段介紹到了火的種類，并且介紹了火的一個(gè)種類，那么按照邏輯，接下來(lái)應(yīng)該談火的另一個(gè)種類。故選A。

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