单项选择题

When people are engaged in a mental activity, they ______.

A．become much wiser
B．are generally happier
C．will be more careful about what they are doing
D．will have a good memory
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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
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
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