单项选择题

Services provided by Golden Touch Construction include ______.

A．kitchen decoration
B．bathroom building
C．bar demolition
D．house purchase
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单项选择题
When people become aging, they will lose some of their ability to bounce back from disease and injury, bounce back here means
A．to improve in health after one's disease and injury
B．to recover from disease and injury
C．to jump after recovering
D．to run fast
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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