单项选择题

A．Half an hour.
B．One hour.
C．One hour and a half.
D．Two hours.
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单项选择题
A．The salesman.B．The manager.C．Mr. Peterson.D．Mary.
A．The salesman.
B．The manager.
C．Mr. Peterson.
D．Mary.
填空题
Why were the Americans in 1910 thinner than todayBecause they worked ( )physically.
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