单项选择题

A．on
B．by
C．over
D．during
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单项选择题
The phrase go natural probably means ______.
A．discharge urine in open
B．change clothes in public
C．do whatever they like
D．behave in a natural way
单项选择题
This passage is mainly about ______.
A．the most important runners in marathon history
B．the history of the Boston Marathon
C．a bizarre rite held in the tiny town of Hopkinton
D．the process of the marathon event
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