单项选择题

The passage is a piece of ______.

A．description
B．narration
C．argumentation
D．disposition
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单项选择题
The author mentions that the maximum THR for older adult participants in sports should he less than ______ beats per minute.
A．60
B．120
C．180
D．240
单项选择题
According to the author, ______.
A．older adults need more physical exercises than the younger ones
B．younger adults are not necessary to take a physical examination before a fitness program
C．fitness programs for older adults should be well-monitored
D．poorly-designed fitness programs for older adults will do serious harms to them
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