单项选择题

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

A．Her diet is not effective.
B．She has lost much weight.
C．Her favorite food is banana.
D．She has neither gained nor lost weight.

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Often associated with crude oil, natural gas is principally made up of___________ and other hydrocarbon gases.

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。