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    【题目】—What does PM 2.5 mean?

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

    A. term B. item C. number D. mark

    【答案】A

    【解析】句意：-PM2.5是什么意思？-这是一个专业的术语，表明空气污染的状况。term术语；学期；item项目；number数字；mark分数，标记。根据句意可知，PM2.5是一个专业的术语，故选A。

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