◎ 题干
阅读理解。
     Antifreeze is a liquid (液体) that is added to water to keep it from freezing. When water freezes and
turns to ice, it expands (膨胀). The force of water expanding is so great that it will break the hardest
metal. Water is used in car engines (发动机) 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
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“阅读理解。 Antifreeze is a liquid (液体) that is added to water to keep it from freezing. When water freezes and turns to ice, it expands (膨胀). The force of …”主要考查了你对  【科教类阅读】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。