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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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 dolphin leapt up into the air because Sagan was too near the water.
A． Right
B． Wrong
C． Not mentioned
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