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
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.
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
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