单项选择题

It is no use debating the relative merits of this policy.

A．making
B．taking
C．discussing
D．expecting
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单项选择题
A red flag was placed there as a token of danger.
A．sign
B．substitute
C．proof
D．target
单项选择题
The fuel tanks had a capacity of 140 liters.
A．function
B．ability
C．power
D．volume
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