One day a rich man meets Tom. The rich man asks, "People say you are very clever  and nothing is difficult  for you. Can you tell my why you are so clever? " Tom answers with a smile, "Oh, I'm not clever. Instead  , you are too _ ." The rich man becomes very very angry. Tom says, "Sir, please don't be angry. If you don't believe me, now let me ask you a very easy question: If you have a group of sheep , I send you another group. Then, you say, how many groups of sheep do you have?" "Why! That's the easiest question in the world. One and one is two. Anybody knows _ . I have two groups of sheep , of course." Tom laughs and says, "You are wrong , Sir. Two groups of sheep put together is still one group. That's the easiest question in the world , isn't it?" From the story we know that  _  .
the rich man is very clever, too. one and one is always two. in fact one and one is not always two Tom is as clever as the rich man