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【单选题】
下列关于大气污染源的表述错误的是。
A.
大气污染物来源于某些自然过程或人为活动
B.
大气污染源可分为天然源和人为源
C.
人为源指人类活动对大气造成的直接污染
D.
火山爆发是天然源中造成大气污染最为严重的原因
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Two colors - black and white - are related to Daoist ideals of simplicity and authenticity, they represent the reality as it is. Also, a line or a shape is valued more than color.
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