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    (2013·福建毕业班质量检查)—What does PM 2.5 mean?
    —It's a professional ________ indicating the condition of air pollution.
    A．termB．itemC．numberD．mark
    A
    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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