问题
选择题
在申办2008年奥运会期间，北京提出了“绿色奥运”的口号，为改善北京的空气质量，将冬季的燃煤取暖改为用天然气做燃料，这主要是（ ）
A．减少SO2气体的排放
B．减少氮氧化物的排放
C．防止温室效应
D．降低对臭氧层的破坏
答案
答案：A
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在申办2008年奥运会期间，北京提出了“绿色奥运”的口号，为改善北京的空气质量，将冬季的燃煤取暖改为用天然气做燃料，这主要是（ ）
A．减少SO2气体的排放
B．减少氮氧化物的排放
C．防止温室效应
D．降低对臭氧层的破坏
答案：A
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