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．They had to work during the performance.B．They couldn’t find time.C．They couldn’t afford to go.D．The tickets were sold out.
A．They had to work during the performance.
B．They couldn’t find time.
C．They couldn’t afford to go.
D．The tickets were sold out.
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