Mrs. Brown lives in London.She has two sons.One is James and the other is Bill. They were born on the same day and they look the same. Mrs.Brown likes them very much and always dresses them in the same clothes，hats，shoes and even socks.

    One day James lost(丢失)his hat when he played football on the playground after school.His mother didn't blame(责备)him because she loved him so much.The next day after lunch she went to a shop with Bill's hat.She hoped to buy the same hat for James as Bill's.She wanted them to have the same kind.She asked the shopkeeper to bring out most of the hats.It took her more than an hour to find the same one.At last she chose(选择)one and said happily，"Excuse me，sir.Could you take it to my car，please？”

    "I'm afraid I can't，madam，" said the shopkeeper in a polite(有礼貌的)voice.

    "Why？"the woman asked in surprise.

    "It's your hat，madam，"the man said with a smile."You don't have a new one here."