单选题 The shopping-bag ladies know the hours when restaurants put their leftovers in the ______ cans where they search for food.
【正确答案】 C
【答案解析】解析：garbage n.食物下脚；[美]垃圾，废料。refuse n.／rubbish n．垃圾，废料。junk n.废物，被扔掉的东西。