单项选择题

The everyday life of a policeman or detective is ______.

A．exciting arid glamorous
B．full of danger
C．devoted mostly to routine matters
D．wasted on unimportant matters
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单项选择题
It can be inferred from what Denis Park says that ______.
A．mental performance can be improved
B．mental ability is determined entirely by brain structure
C．people of different ages use different parts of the brain for memorizing
D．different parts of the brain are responsible for different mental activities
单项选择题
The passage is meant to ______.
A．emphasize the importance of exercising the brain
B．analyze the difference between different age groups in the loss of memory
C．reveal the decrease in mental ability of young adults as well as older adults
D．introduce effective ways to improve memory
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