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【单选题】
2019 年世界环境日主题聚焦 “ 空气污染 ” ,以下有关空气污染和防治的说法正确 的是A.
．常见的空气污染物有 CO 、 SO 2 、 CO 2
B.
．加高烟囱将工厂废气排放到大气中
C.
．植树造林对治理大气污染有促进作用
D.
．利用廉价煤炭，大力发展火力发电
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