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【单选题】
将干冰投入装水的玻璃瓶中时，发现剧烈“沸腾”，瓶口出现大量“白气”，此“白气”是 [ ]A.
干冰升华产生的大量白色二氧化碳气体
B.
干冰升华放热使水汽化形成的水蒸气
C.
千冰熔化吸热使空气中水蒸气液化形成的小水滴
D.
干冰升华吸热使空气中水蒸气液化形成的小水滴
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