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    —What does PM2.5 mean?

    —It's a professional ________ indicating the condition of air pollution.

    A．term B．item

    C．number D．mark

     

    A

    【解析】A 考察名词辨析。句义：—PM2.5什么意思啊？—那是一个标明空气状况的专业术语。Term意为“术语”，符合题意。BCD三项与句义不符。故A正确。

     

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