单项选择题

This passage is mainly concerned with ______.

A．man’s aging process
B．man’s life span
C．man’s health
D．man’s medical care
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单项选择题
In order to live longer, _____.
A．we have to try to be on a diet
B．we should keep in high spirits
C．we should try to do more exercise
D．we should postpone the process of aging
单项选择题
Which of the following is NOT mentioned as a factor contributing to one's health
A．The right food you eat.
B．Lots of exercise you get.
C．Your living conditions.
D．The amount of stress you are under.
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