单项选择题

A．New traffic rules.
B．Traffic jams on highways.
C．Air traffic conditions.
D．Road conditions.
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单项选择题
A．Students from America.B．Students from England.C．Students from Australia.D．Students from Japan.
A．Students from America.
B．Students from England.
C．Students from Australia.
D．Students from Japan.
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.
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