单项选择题

Where is the researches based in

A．Arizona & Colorado
B．Arizona & California
C．Colorado &California
D．Arizona & Georgia
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单项选择题
Who is most likely to want a higher speed limit
A．Drivers with turbo-charged vehicles.
B．Professional truck drivers.
C．Older people.
D．People from the Southern US.
单项选择题
When was the Tunnel opened to the public
A．1990.
B．1991.
C．1992.
D．1993.
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