Usually a meteorological observatory (氣象臺) _____ air quality in urban areas from one to five: excellent, fairly good, slightly polluted, poor, and dangerous.
A．identifiesB．purifiesC．classifiesD．clarifies
C

試題分析：考查動詞：A. identifies識別，B. purifies使…純潔，使…凈化，C. classifies分類，分別，D. clarifies闡述，說明，句意：通常一個氣象觀測站把城市中的空氣質(zhì)量分類從一到五:非常好,相當(dāng)好,輕微污染,差,和危險的。選C。
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