单项选择题

A．Alcohol.
B．Electricity.
C．Synthetic fuel.
D．Solar energy.
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单项选择题
A．To explain a new requirement for graduation.B．To interest students in a community service project.C．To discuss the problems of elementary school students.D．To recruit elementary school teachers for a special program.
A．To explain a new requirement for graduation.
B．To interest students in a community service project.
C．To discuss the problems of elementary school students.
D．To recruit elementary school teachers for a special program.
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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