单项选择题

A red flag was placed there as a token of danger.

A．sign
B．substitute
C．proof
D．target
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单项选择题
The fuel tanks had a capacity of 140 liters.
A．function
B．ability
C．power
D．volume
单项选择题
The secretary is expected to explore ideas for post-war reconstruction of the area.
A．deny
B．investigate
C．stress
D．create
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