单项选择题

According to Foard, people can make their brains work more effectively by ______.

A．constantly doing memory work
B．taking part in various mental activities
C．going through specific training
D．making frequent adjustments
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单项选择题
According to the passage, someone who has had an active mind will ______.
A．go into old age much earlier than those who don't have an active mind
B．be able to memorize enormous amounts of information
C．keep more mentally healthy
D．be more alert and receptive
单项选择题
What is the passage mainly about
A．How biochemical changes occur in the human brain.
B．Why people should keep active not only physically but also mentally.
C．How intellectual activities influence brain-cell health.
D．Why people should receive special mental training as they age.
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