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．It is a story about a dull boy.B．Jack worked for a whole day.C．Everyone needs recreation to keep fit.D．Playing is good, but work is dull.
A．It is a story about a dull boy.
B．Jack worked for a whole day.
C．Everyone needs recreation to keep fit.
D．Playing is good, but work is dull.
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