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

A．At a concert.
B．In a museum.
C．In a movie theater.
D．At a dinner party.

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Natural gas trapped in underground reservoirs is extracted by ______.

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People renewed their interest in natural gas as a fuel as a result of ______ of the late 1960s and early 1970s.

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