阅读理解：阅读下面的短文，然后根据短文内容选择最佳答案。

　　A very young boy, Tom, lives a long way from the city．One day he goes to the city to visit his friend, Jack．Jack asks Tom to have lunch together．They go into the restaurant and sit down at a table．Tom looks around and he sees some old people put eye glasses on before reading their books, so after lunch he goes to a shop to buy some glasses, too．He walks along the road, and soon finds a shop．The man in the shop makes him try on a lot of glasses, but Tom always says, “No, I can't read with these．”

　　The man in the shop becomes more and more puzzled(困惑的)．At last he says, “Excuse me, but can't you read at all? ”

　　“No, I can't．” Tom says, “If I can read, do you think I come here to buy glasses? ”

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