单项选择题

A．Most of us should take more exercise.
B．It’s better to live in the town.
C．The brain contracts if it is not used.
D．The more one uses his brain, the sooner he becomes ol
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单项选择题
A．Because people have to spend too much time and energy to produce it.B．Because too much grain protein is needed to produce it.C．Because it contains too much fat and protein.D．Because it is not good to the healt
A．Because people have to spend too much time and energy to produce it.
B．Because too much grain protein is needed to produce it.
C．Because it contains too much fat and protein.
D．Because it is not good to the healt
单项选择题
A．Our brain contract as we grow old.B．One part of the brain does not contract.C．Sixty-year olds have better brains than thirty-year olds.D．Some people’s brains have contracted earlier than other people’s.
A．Our brain contract as we grow old.
B．One part of the brain does not contract.
C．Sixty-year olds have better brains than thirty-year olds.
D．Some people’s brains have contracted earlier than other people’s.
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