单项选择题

A．Working as a tourist guide.
B．Working as a shop assistant.
C．Helping in a restaurant.
D．Looking after a laboratory.
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单项选择题
A．50 years.B．100 years.C．200 years.D．300 years.
A．50 years.
B．100 years.
C．200 years.
D．300 years.
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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