What are the main factors that determine different rates of aging？A．Optimistic ways of lif
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What are the main factors that determine different rates of aging？
A．Optimistic ways of life.
B．A family with three children.
C．A regular sleep pattern.
D．Heredity and life-style.
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正确答案：D
解析：文中“We all age at different rates. Heredity clearly plays an important part，…life-style. may be equally significant…”说明了决定生命进程的两个因素：遗传与生活方式。