阅读理解。 Antifreeze is a liquid (液体) that is added to water to keep it fr

题文

阅读理解。     Antifreeze is a liquid (液体) that is added to water to keep it from freezing. When water freezes and turnsto ice, it expands (膨胀). The force of water expanding is so great that it will break the hardest metal. Wateris ud 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℃；fourparts 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 u antifreeze that does not boil away when the engine is running. There are veral chemicals that do this. One of the most popular is called ethylene glycol. 1. People u ________ to keep car engines cool. A. antifreeze B. waterC. alcoholD. ethylene glycol 2. The usual kind of antifreeze freezes at ________. A. 0℃ B. －18℃ C. －22℃ D. －40℃ 3. We u antifreeze in order to ________. A. keep alcohol in water B. stop ice from becoming water C. make the freezing point of water lower D. rai the freezing point of water 4. Besides alcohol, ________ is another kind of popular antifreeze. A. waterB. 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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答案

1-5      BDCBA

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据考高分专家说，试题“阅读理解。 Anti.....”主要考查你对 [科教类阅读 ]考点的理解。

科教类阅读

科普类的阅读：科普类的阅读理解包含介绍科学知识、社会知识的短文。阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等。如果是介绍社会现象的文章，要掌握所谈现象的内涵。

答题技巧：1. 加强整体意识，把握文章的主要内容。在阅读的时候可给段落标上序号，并给重要的句子和   关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源。 2. 审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式。 3. 定位阅读，强化对应意识。同时要注意原文利用和自我加工相结合。