单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Buy something to eat on the train.
B．Take the five o’ clock train
C．Wait to catch a later train.
D．Take the train to the airport,

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问答题

By making vehicles lighter in weight, aluminum ____________________ (大减少了开动它们所需的燃料).

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Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。