单项选择题

Why was the speed limit first reduced to 55 miles-per-hour

A．The older people wanted it.
B．The voters decided on it.
C．It was decided that speeds above that were not safe.
D．The US had a fuel crisis.
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单项选择题
How long is the shaft
A．21 miles.
B．23 miles.
C．31miles.
D．33 miles.
单项选择题
What is not true about the building of the Channel
A．A British team started to drill southeast from Dover.
B．A French team started to drill northwest from Sangatte.
C．The two teams started drilling in 1988.
D．The two teams met under the channel in December 1990.
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