科研之友
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摘要
<正>Little Danny’s father got two friends come over for dinner.When the dinner was nearly over,Danny went to the kitchen and carried in the first piece of apple pie,giving it to his father who passed it to a friend.Little Danny came in with a second piece of pie and gave it to his father,who again gave it to the other friend.Danny was confused and said, "Dad,the pieces are all the same size."
