单项选择题


Questions 13 to 15 are based on the conversation you have just heard.

A．Droughts.
B．Floods.
C．Fossil fuels.
D．Global warming.
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单项选择题
A．They will remain stable.B．They will be raised.C．They have been changing all the time.D．They are determined directly by the supply and demand of the market.
A．They will remain stable.
B．They will be raised.
C．They have been changing all the time.
D．They are determined directly by the supply and demand of the market.
单项选择题
A．10:20.B．10:12.C．10:28.D．10:08.
A．10:20.
B．10:12.
C．10:28.
D．10:08.
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