单项选择题


Questions 22 to 25 are based on the conversation you have just heard.

A．In a research institute.
B．In a zoo.
C．On the beach.
D．On the campus.
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单项选择题
A．They were driven by steam engines.B．They were pulled by riders themselves.C．They were pulled by animals or humans.D．There were totally unusable.
A．They were driven by steam engines.
B．They were pulled by riders themselves.
C．They were pulled by animals or humans.
D．There were totally unusable.
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