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 author, policemen view their profession as ______.
A．dangerous but adventuresome
B．full of corruption
C．full of routine
D．worth the effort
单项选择题
Which of the following statements is true about William Harris
A．He is interested in science.
B．He changes his mind easily.
C．He is not good at painting at all.
D．He doesn’t worry about the security of a profession the way his father did.
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