问题描述：
Let's guess.Who's that?(猜一猜：他是谁?)
A man looked at a phto and said,“That person's father is my father's son.I've no bothers or sisters.Who is he?”
A man looked at a phto and said,“That person's father is my father's son.I've no bothers or sisters.Who is he?”
问题解答：
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