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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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
Why are some scientists interested in studying senescence
A．They want to increase the general ability of our bodies.
B．They may be able to find a better way to our life.
C．If they can pin down the biochemical process that makes us age, there will be hope for extending the length of life.
D．They want to find out if there is a link between how efficiently a cell could repair itself and how long a creature lives.
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