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    【题目】---What does PM2.5 mean?

    --- It’s a professional ______ indicating the condition of air pollution.

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

    【答案】C

    【解析】

    试题分析：考查名词。选项A意为数字；选项B意为记号、成绩；选项C意为学期、专业术语；选项D意为物品、条款。故选择C，句意为：这是一种专业术语，指空气污染的状态。

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