分析 這是一篇科普知識類閱讀,短文主要介紹了Antifreeze是什么,首先,作者在文章的開頭就給出了它的定義和具體的說明,然后又具體說明了Antifreeze的主要用途和作用.
解答 66 B 細(xì)節(jié)理解題.根據(jù)文中第一段中Water is used in car engines(發(fā)動機(jī)) to keep them cool while they run水用來汽車發(fā)動機(jī)運(yùn)行時冷卻下來.故選B.
67 D 細(xì)節(jié)理解題.根據(jù)文中第二段the usual kind of antifreeze will not freeze until the temperature is-40℃結(jié)冰一般的防凍劑直到溫度為-40℃才會凍結(jié).故選D.
68 C 理解推斷題.根據(jù)文中第二段中Water freezes at 0℃;the usual kind of antifreeze will not freeze until the temperature is-40℃.水在零度才會結(jié)冰,一般種類的抗凝劑會直到零下40度才會開始結(jié)冰,可知抗凝劑的作用是降低了水的凝固點(diǎn),故選C.
69 B 理解推斷題.根據(jù)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也有與alcohol相似的作用,故選B.
70 A 主旨大意題.縱觀全文,可知作者在文章的開頭就給出了Antifreeze的定義和具體的說明:Antifreeze is a liquid(液體) that is added to water to keep it from freezing.然后又具體說明了Antifreeze的主要用途和作用,可知這篇文章使用來介紹什么是Antifreeze,故選A.
點(diǎn)評 首先要仔細(xì)閱讀文章,掌握大意,然后結(jié)合具體的題目再讀短文,從中找出相關(guān)的信息,就可以確定正確答案.
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