单项选择题

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

A．A more economical diesel fuel.
B．Characteristics of a new type of fuel.
C．Where a new energy source is located.
D．How to develop alternative energy sources.

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单项选择题

A．In the side street.B．At the crossroads.C．On the main road.D．On the motorway.

A．In the side street.
B．At the crossroads.
C．On the main road.
D．On the motorway.

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

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