单项选择题


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

A．The bus stop.
B．The bad weather:
C．The late bus.
D．The traffic jam.
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单项选择题
The gasoline-powered vehicles are prevalent as a result of ______.
A．comparatively low price of fossil fuels
B．reducing less harmful emissions
C．difficult tasks to design, develop and sale "green" cars
D．high fuel efficiency and protecting environment
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