单项选择题

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

A．Before economics.
B．In about an hour.
C．The next day.
D．During economics class.
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单项选择题
A．Alcohol.B．Electricity.C．Synthetic fuel.D．Solar energy.
A．Alcohol.
B．Electricity.
C．Synthetic fuel.
D．Solar energy.
单项选择题
A．An affluent one.B．A Ix)or one.C．A suburban one.D．A rural one.
A．An affluent one.
B．A Ix)or one.
C．A suburban one.
D．A rural one.
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