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
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单项选择题
The last word of the passage addictive means ______.
A．excessive
B．enthusiastic
C．dependent
D．progressive
单项选择题
The passage is a piece of ______.
A．description
B．narration
C．argumentation
D．disposition
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