单项选择题

A．Air traffic conditions.
B．Traffic jams on highways.
C．Road conditions.
D．New traffic rules.
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单项选择题
A．Green.B．Red.C．White.D．Black.
A．Green.
B．Red.
C．White.
D．Black.
单项选择题
A．5,400,000 years.B．65,000,000 years.C．8,400,000 years.D．75,000,000 years.
A．5,400,000 years.
B．65,000,000 years.
C．8,400,000 years.
D．75,000,000 years.
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