单项选择题

According to the passage, _________ may prevent Alzheimer's disease.

A．physical exercise
B．diet
C．operation
D．anti-inflammation medicines
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单项选择题
We can infer from the passage that people suffering from Alzheimer's disease will _________.
A．lose their memory when they grow old.
B．lose the ability to protect themselves.
C．result in inflammation and oxidation.
D．die a few years after the disease is detected.
单项选择题
According to the passage, brain cells _________.
A．are highly active.
B．often stop communicating with each other as we. grow old.
C．are unable to process thoughts.
D．are like old married couples.
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