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    —What does PM 2.5 mean?

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

    A．term B．item C．number D．mark

     

    A

    【解析】A　句意：“PM 2.5是什么意思？”“它是一个表明空气污染状况的专业术语。”term在此表示“术语”。

     

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