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【单选题】
2013年5月30日，合肥市新桥国际机场正式启用，为了保证飞机的正常起飞，飞机场周围大片区域实行秸杆禁烧．下列有关环境保护和水资源说法正确的是（ ）A.
燃烧植物秸秆不会造成大气污染
B.
化学在环境监测和保护中起重要作用
C.
区分软水和硬水的方法是煮沸
D.
自来水中只含水分子，不含其它粒子
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