【題目】某城市某日的空氣污染指數(shù)是51～100，那么該市天空質(zhì)量狀況是（ ）

A. 優(yōu) B. 良 C. 輕度污染 D. 中度污染

【答案】B

【解析】某城市某日的空氣污染指數(shù)是51～100，那么該市天空質(zhì)量狀況是良．

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