单项选择题

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

A．Families with cars.
B．Americans’ heavy dependence on cars.
C．Roads and highways.
D．Traffic problems in America.

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单项选择题

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