单项选择题

A．In a research institute.
B．On the beach.
C．In a zoo.
D．On the campus.
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单项选择题
A．As unusually good.B．As not very good.C．As quite ordinary.D．As unsatisfactory.
A．As unusually good.
B．As not very good.
C．As quite ordinary.
D．As unsatisfactory.
单项选择题
A．They were driven by steam engines.B．They were pulled by animals or humans.C．They were pulled by riders themselves.D．There were totally unusable.
A．They were driven by steam engines.
B．They were pulled by animals or humans.
C．They were pulled by riders themselves.
D．There were totally unusable.
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