单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

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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单项选择题

Passage TwoQuestions 29 to 31 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。