(2013·福建畢業(yè)班質(zhì)量檢查)—What does PM 2.5 mean?

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

A．term B．item C．number D．mark

 

A

【解析】A　句意：“PM 2.5是什么意思？”“它是一個表明空氣污染狀況的專業(yè)術(shù)語。”term在此表示“術(shù)語”。

 

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