.筛选出超市A在几家超市中最便宜的商品
dic = {"超市A":
{"哈密瓜":7.8,"香蕉":4,"苹果":3.8,"橘子":3.5,"猕猴桃":5.0,"柚子":1.8,"葡萄":3.2,"西梅": 12.5},
"超市B":
{"香蕉":3.8,"哈密瓜":7.8,"苹果":4.5,"橘子":3.9,"柚子":1.9,"猕猴桃":5.5,"火龙果": 11,"葡萄":3.3},
"超市C" :
{"香蕉":3.5,"哈密瓜":7.5,"苹果":4.9,"橘子":3.5,"柚子":1.99,"猕猴桃":4.99,"火龙果": 10,"葡萄":3.6}
}
？