增加绿化面积是解决城市环境的重要途径之一。据此回答12～13

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增加绿化面积是解决城市环境的重要途径之一。据此回答12～13题。
在大城市提倡的营建“绿色屋顶”和“绿色阳台”，其改善环境的主要作用是

A．减少城市的噪声和光污染	B．减少热岛效应和美化环境
C．减轻光化学烟雾的污染	D．降低空气中可吸入颗粒物数量

我国北方一些城市在城市绿化中因使用杀虫剂而污染了地下水。下列绿化方式中污染最为严重的是

A．落叶阔叶树林	B．常绿针叶树林
C．“绿色屋顶”和“绿色阳台”	D．人工草地

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