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 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

题型：阅读理解  难度：中档

答案

1-5: BDCBA

据专家权威分析，试题“阅读理解。 Antifreeze is a liquid (液体) that is added to wa..”主要考查你对  科教类阅读  等考点的理解。关于这些考点的“档案”如下：

科教类阅读

考点名称：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。