题目内容
Why does the author say that the boundary between middle age and old age cannot be defined exactly?
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Why was the age of 65 traditionally considered the beginning of the senior years in the United States of America and the United Kingdom?
Why is the number of old people growing around the world?
How should we treat old people?
A=左下，B=左上，C=上，D=右上A: ______1______B: _______2_______C: ______3______D: _______4_______
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