【題目】—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？-這是一個(gè)專業(yè)的術(shù)語，表明空氣污染的狀況。term術(shù)語；學(xué)期；item項(xiàng)目；number數(shù)字；mark分?jǐn)?shù)，標(biāo)記。根據(jù)句意可知，PM2.5是一個(gè)專業(yè)的術(shù)語，故選A。

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