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
It is laid down in the regulations that all members must carry their membership cards at all times.
A．suggested
B．warned
C．stated
D．described
单项选择题
The book provides a concise analysis of the country’s history.
A．clean
B．perfect
C．real
D．brief
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