One fine afternoon I was walking along Fifth Street, when I remembered that it was necessary to buy a pair of socks. Why I wished to buy only one pair is unimportant. I turned into the first sock shop that caught my eye, and a boy clerk who could not have been more than seventeen years old came forward, 'What can I do for you, sir?' 'I wish to buy a pair of socks.' His eyes shone. There was a lot of excitement in his voice, 'Did you know that you had come into the finest place in the world to buy socks?' I had no idea of that, as my entrance had been accidental(偶然的). 'Come with me,' said the boy, eagerly. I followed him to the back of the shop, and he began to pull down from the shelves box after box showing their socks for my choice. 'Hold on, lad, 1 am going to buy only one pair? 'I know that,' said he, 'but I want you to see how beautiful these are. Aren't they wonderful!' There was on his face an expression of seriousness and pride and delight as if he were showing to me the secret of his religion(宗教). I became far more interested in him than in the socks. I looked at him in surprise. 'My friend,' said I, 'if you can keep this up, if this is not just from a new job, if you can keep up this high spirit and excitement day after day, in ten years you will win every sock shop in the United States.' What did the writer want to buy one fine afternoon?