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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