【題目】---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】

試題分析：考查名詞。選項(xiàng)A意為數(shù)字；選項(xiàng)B意為記號、成績；選項(xiàng)C意為學(xué)期、專業(yè)術(shù)語；選項(xiàng)D意為物品、條款。故選擇C，句意為：這是一種專業(yè)術(shù)語，指空氣污染的狀態(tài)。

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