单项选择题

Pigeons have been known to fly as fast as _____.

A．75 mph
B．50 mph
C．110 mph
D．62 mph
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单项选择题
According to the passage, the Paula Jones' case was _____.
A．nothing important.
B．very significant.
C．doubtful.
D．vulnerable.
单项选择题
Race horses are hard to train because they are _____.
A．faster than other horses
B．smaller than other horses
C．more suspicious than other horses
D．more nervous than other horses
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