近30年来，北京的汉白玉雕像溶蚀严重，有的雕像溶蚀厚度已超过

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近30年来，北京的汉白玉雕像溶蚀严重，有的雕像溶蚀厚度已超过了1厘米，比自然状态下的溶蚀速度快几十倍，这主要是因为

A．城市上空尘埃多，作为凝结核使城市的降水增多

B．城市的气温比郊区高

C．大量使用煤和石油，城市空气中二氧化碳和碳氢化和物含量增加

D．燃烧煤和石油，排放大量粉尘、二氧化碳等有害物质，产生酸雨

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