参考答案

正确答案：D
解析：细节题。依据是第二段的第六句：You put the chips in your shopping bag before leaving home, and then they will tell you what you already have in your refrigerator．A选项和文中When you go to a grocery store相矛盾；文中第二段最后一句：And the chips will charge your credit card, so that you don't need to wait for a long time before the cash desk any more说的是芯片会自动从信用卡上扣除钱, 并没有说不用花钱就能买东西, B选项不正确；第二段提到your phone will tell the oven when to start cooking, so that the meal has been ready when you get home并不是说没有RFIDs我们就不会使用烤箱, 只是说RFIDs使我们可以更有效率地使用烤箱, 因此C不对。