Many cities issued a warning of         air pollution for PM-2.5 readings, which became
        Concern of all the people
A．the; theB．the;/C．/;aD．a(chǎn)n;a
C

試題分析：第一個空，空氣污染應(yīng)是一個抽象的概念, 抽象名詞前不用冠詞；第二個空，表示泛指“關(guān)心的一件事”，故用不定冠詞a。
點評：冠詞的考查，其實就是在圍繞該用不該用，用哪一類冠詞。解答有關(guān)冠詞的題型首先必須要把題目完完整整看清楚，理解句子意思，然后可以從三方面入手，一是習慣搭配，二是固定短語，三是具體語境分析。對于固定短語平時應(yīng)多讀多記。
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