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据报道，2005年3月，广州市实施大面积人工降雨，其中使用了液氮作增雨剂。根据你现有的知识推测下列说法中正确的是

A. 液氮是一种溶液 B. 使用液氮会污染环境，应严格控制使用

C. 降落的雨滴中将含有大量的液氮 D. 液氮气化使空气中的水蒸气凝结成水珠落下