单项选择题

According to Fozard's argument, people can make their brain work more efficiently by______ .

A．taking part in various mental activities
B．making frequent adjustments
C．going through specific training
D．constantly doing memory work
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单项选择题
What is the passage mainly about
A．How biochemical changes occur in the human brain.
B．Why biochemical changes Occur in the human brain.
C．How intellectual activities influence brain-cell health.
D．Why people should keep active not only physically but also mentally.
单项选择题
Older people are generally advised to ______ .
A．keep fit by going in for physical activities
B．keep mentally active by challenging their brains
C．maintain mental alertness through specific training
D．maintain a balance between individual and group activities
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