单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A) As unusually good. C) As quite ordinary.
B) As not very good. D) As unsatisfactory.
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单项选择题
A) They were driven by steam engines. C) They were pulled by riders themselves. B) They were pulled by animals or humans. D) There were totally unusable.
A) They were driven by steam engines. C) They were pulled by riders themselves.
B) They were pulled by animals or humans. D) There were totally unusable.
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