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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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.
单项选择题
How long has Lidai Diwang Miao been in part of a middle school in Beijing
A．470 years.
B．159 years.
C．71 years.
D．188 years.
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