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
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单项选择题
Which of the following statements is NOT true
A．Not until the loss of memory affects their daily activities, do people notice the decrease in their mental abilities.
B．People begin to lose memory in their twenties.
C．Older people tend to remember false information as being true.
D．Younger people find it easier to remember the information that is proven false.
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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