单项选择题

The author's main criticism of John Lott is that he ______.

A．advocates private ownership of firearms
B．is not objective in his analysis
C．has analyzed a wrong period
D．has cited dubious statistics
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单项选择题
According to the text, retirement can benefit those who ______.
A．have always had very busy work in their lives
B．have previously had depressing work experiences
C．can find more stimulating activities than they had through work
D．have had high-level jobs or very stimulating work experiences
单项选择题
The example of tennis is mentioned in the last paragraph to suggest that mental exercise ______.
A．can counter age-related mental decline in a comprehensive way
B．offers benefits directly bound up with that kind of exercise
C．should be paired with physical exercise for maximum benefit
D．is comparable to physical activities in term of its importance to overall health
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