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    精英家教网 > 初中英语 > 题目详情
    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
    1-5: BDCBA
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