-What does PM 2.5 mean?-It's a professional indicating the condition of air pollution.A．term B．item C．number D．mark 题目和参考答案——青夏教育精英家教网—

题目内容

—What does PM 2.5 mean?

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

A．term B．item C．number D．mark

【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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