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 their is a link between how efficiently a cell could repair itself and how long a creature lives.
24．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．
25．This passage Is mainly concerned with_____．
A．man’s aging process
B．man’s life span
C．man’s health
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