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    精英家教网 > 高中英语 > 题目详情
    —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
    选A　考查名词辨析。句意：“PM 2.5是什么意思？”“它是一个表示空气污染状况的专业术语。”term“术语”，符合句意。item“项目”；number“数字”；mark“记号”。
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