单项选择题

According to Coffey's research, the brain may benefit from______.

A．running
B．playing chess
C．swimming
D．playing football
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单项选择题
Which of the following statements is true
A．The brain of an adult person shrinks 2. 5% every 10 years.
B．The cerebrospinal fluid of a person with 8 years of education may have increased 17. 7 milliliters.
C．The cerebrospinal fluid of a person with 16 years of education may increase by 10%.
D．The brain of an aged person shrinks 5% every 10 years.
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