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    2．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．identifiesB．purifiesC．classifiesD．clarifies

    分析 通常一个气象观测站把城市中的空气质量分成一到五个等级：非常好，相当好，轻微污染，差，和危险的．

    解答 答案是C．本题考查动词词义辨析．A．identifies识别，B．purifies使…纯洁，使…净化，C．classifies分类，分别，D．clarifies阐述，说明，根据句意，城市空气质量"分类"为5个等级，答案选择C项，其它选项不符合逻辑．

    点评 本题考查动词词义辨析，考生在平时的学习中应注意积累相应的词汇和搭配，并牢记其意思．在做题时，将词义和题干相结合，从语法、句子结构尤其是句意上去判断，句意通顺，符合逻辑，即正确答案．

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