【单选题】【消耗次数：1】
以下引起亚硝酸盐中毒的情况不包括（）
①
A、蔬菜腐烂变质
②
B、煮熟的菜存放过久
③
C、蒸锅水连续使用，不断浓缩或煮菜熬粥
④
D、正常烹调的新鲜蔬菜
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引起亚硝酸盐食物中毒的原因是（ ）。
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