题目内容
Usually a meteorological observatory (气象台) _____ air quality in urban areas from one to five: excellent, fairly good, slightly polluted, poor, and dangerous.
| A.identifies | B.purifies | C.classifies | D.clarifies |
C
试题分析:考查动词:A. identifies识别,B. purifies使…纯洁,使…净化,C. classifies分类,分别,D. clarifies阐述,说明,句意:通常一个气象观测站把城市中的空气质量分类从一到五:非常好,相当好,轻微污染,差,和危险的。选C。
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