分析 这是一篇科普知识类阅读,短文主要介绍了Antifreeze是什么,首先,作者在文章的开头就给出了它的定义和具体的说明,然后又具体说明了Antifreeze的主要用途和作用.
解答 66 B 细节理解题.根据文中第一段中Water is used in car engines(发动机) to keep them cool while they run水用来汽车发动机运行时冷却下来.故选B.
67 D 细节理解题.根据文中第二段the usual kind of antifreeze will not freeze until the temperature is-40℃结冰一般的防冻剂直到温度为-40℃才会冻结.故选D.
68 C 理解推断题.根据文中第二段中Water freezes at 0℃;the usual kind of antifreeze will not freeze until the temperature is-40℃.水在零度才会结冰,一般种类的抗凝剂会直到零下40度才会开始结冰,可知抗凝剂的作用是降低了水的凝固点,故选C.
69 B 理解推断题.根据文中第三段中There are several chemicals that do this.One of the most popular is called ethylene glycol可知ethylene glycol也有与alcohol相似的作用,故选B.
70 A 主旨大意题.纵观全文,可知作者在文章的开头就给出了Antifreeze的定义和具体的说明:Antifreeze is a liquid(液体) that is added to water to keep it from freezing.然后又具体说明了Antifreeze的主要用途和作用,可知这篇文章使用来介绍什么是Antifreeze,故选A.
点评 首先要仔细阅读文章,掌握大意,然后结合具体的题目再读短文,从中找出相关的信息,就可以确定正确答案.
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