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My grandfather is already sixty years old. But he has only fifteen birthdays. Do you know why? When is his birthday? Keys: His birthday is on February 29th. It's a leap(闰年)year every four years. So he has only fifteen birthdays. 1.An interesting______. 2. My grandfather is______years old. 3. He has only______birthdays. 4. His birthday is on______ 5. A leap year happens(发生)every ______ years. |