单项选择题

A．Synthetic fuel.
B．Solar energy.
C．Alcohol.
D．Electricity.
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单项选择题
A．Because there are no signs to direct them.B．Because no tour guides are available.C．Because all the buildings in the city look alike.D．Because the university is everywhere in the city.
A．Because there are no signs to direct them.
B．Because no tour guides are available.
C．Because all the buildings in the city look alike.
D．Because the university is everywhere in the city.
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