【題目】Antifreeze is a liquid(液體) that is added to water to keep it from freezing． When water freezes and turns to ice，it expands(膨脹)．The force of water expanding is so great that it will break the hardest metal．Water is used in car engines(發(fā)動(dòng)機(jī)) to keep them cool while they run，and if this water is allowed to freeze in winter it can break the iron block of the engine．That is why antifreeze is necessary．

Water freezes at 0℃；the usual kind of antifreeze will not freeze until the temperature is－40℃．A mixture(混合物) of five parts of water and four parts of antifreeze will prevent freezing at－18℃；four parts of water and five parts of antifreeze reduce this to －22℃．

Alcohol is a kind of good antifreeze，but when the air is running it becomes hot and the alcohol boils away，so it must be changed very often．Most people use antifreeze that does not boil away when the engine is running．There are several chemicals that do this．One of the most popular is called ethylene glycol．

【1】people use ________ to keep car engines cool．

A. antifreeze B. water C. alcohol D. ethylene glycol.

【2】The usual kind of antifreeze freezes at ________．

A. 0℃ B. －18℃ C. －22℃ D. －40℃

【3】We use antifreeze in order to ________．

A. keep alcohol in water

B. stop ice from becoming water

C. make the freezing point of water lower

D. raise the freezing point of water

【4】Besides alcohol，________ is another kind of popular antifreeze．

A. water B. ethylene glycol C. any chemical D. any mixture

【5】The text is written to ________．

A. tell us what antifreeze is

B. make people buy antifreeze

C. tell us that cars need antifreeze

D. show us how to protect car engines

【答案】

【1】B

【2】D

【3】C

【4】B

【5】A

【解析】

防凍液是一種液體，加入到水中可防止水結(jié)冰。當(dāng)水結(jié)成冰的時(shí)候，它會(huì)膨脹。水膨脹的力很大，可以把最硬的金屬漲破。這就是為什么在冬天汽車的引擎中加防凍液的原因。

【1】細(xì)節(jié)理解題。根據(jù)文章第一段三，四兩行可知。

【2】細(xì)節(jié)理解題。根據(jù)文章第一段倒數(shù)第三行，四行可知。

【3】細(xì)節(jié)理解題。根據(jù)文章第一段倒數(shù)一二兩行可知。

【4】細(xì)節(jié)理解題。根據(jù)文章最后一段最后一句可知。

【5】主旨大意題。這篇文章主要講述的是什么是防凍液以及為什么會(huì)使用防凍液。

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