单选题：将一定质量的铁粉和氧化铜粉末投入到一定质量的稀硫酸中，充分反应后过滤，得到滤液M和滤渣N，下列有关说法： ①滤液M中一定含有硫酸铁，可能含有硫酸和硫酸铜；②在滤

题目内容：

将一定质量的铁粉和氧化铜粉末投入到一定质量的稀硫酸中，充分反应后过滤，得到滤液M和滤渣N，下列有关说法： ①滤液M中一定含有硫酸铁，可能含有硫酸和硫酸铜；

②在滤液M中放入一块刚打磨过的锌片，一定有置换反应发生；

③向滤渣N中滴加稀硫酸．可能有气泡产生；

④当滤液M中含有硫酸铜时，滤渣N中一定没有氧化铜

其中一定正确的说法是（）

A①②

B②③

C③④

D①④

答案解析：

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