单项选择题
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A．Retirement Guide.
B．How to Estimate Life Expectancy.
C．The Youngest Baby Boomers.
D．How to Live Longer.
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单项选择题
A．Working late.B．Unbalanced diet.C．Worrying.D．Eating too much.
A．Working late.
B．Unbalanced diet.
C．Worrying.
D．Eating too much.
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