单项选择题

People liked bicycles because they were ______ horses.

A．cheaper than
B．as cheap as
C．more expensive than
D．as expensive as
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单项选择题
People went back to the countryside when they had ______.
A．holidays
B．bicycles
C．horses
D．wagons
单项选择题
This is a set of recommendations for ______.
A．doctors prescribing for patients
B．doctors training people who take drugs
C．drug companies
D．persons who sell drugs
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