填空题

What does the author mainly discuss in this passage

【参考答案】

The role of mental stimulation in preventing mental aging.
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填空题
The word it in the saying use it or lose it (Paragraph 1) refers to ______.
单项选择题
A．The population of elderly people.B．Nuclear weapon.C．Standard of living.D．Violence in crime.
A．The population of elderly people.
B．Nuclear weapon.
C．Standard of living.
D．Violence in crime.
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