(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．termB．itemC．numberD．mark
A
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)術語�！眛erm在此表示“術語”。
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