单项选择题

The text informs us that______.

A．Mental capacity is surely measured by education level
B．More-educated people never develop habits harmful to health
C．People should keeping stimulating the brain to bear more brain-tissue loss
D．We should take less adventuresome way to stimulate the brain

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单项选择题We can know from the first paragraph that______.

A．Brains of the more-educated people may become more contracted when they get aged
B．Education may do harm to people's brains
C．More educated people may suffer from brain tissue loss
D．The less educated can resort to more cognitive reserves when aged

单项选择题According to the second paragraph, it can be found by researchers that______.

A．Only educated people suffer from brain shrinkage
B．The more the brain shrinks, the more abnormal people's cognition and memory become
C．People might loss no mentality even with brain shrinkage
D．No brain-tissue loss will be induced by indulgence in alcohol