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2．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

分析 通常一個氣象觀測站把城市中的空氣質量分成一到五個等級：非常好，相當好，輕微污染，差，和危險的．

解答 答案是C．本題考查動詞詞義辨析．A．identifies識別，B．purifies使…純潔，使…凈化，C．classifies分類，分別，D．clarifies闡述，說明，根據句意，城市空氣質量"分類"為5個等級，答案選擇C項，其它選項不符合邏輯．

點評 本題考查動詞詞義辨析，考生在平時的學習中應注意積累相應的詞匯和搭配，并牢記其意思．在做題時，將詞義和題干相結合，從語法、句子結構尤其是句意上去判斷，句意通順，符合邏輯，即正確答案．

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