单项选择题

Britain has the highest （） of road traffic in the world -- over sixty cars for every mile of road.

A．popularity
B．density
C．intensity
D．prosperity

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单项选择题

It’s just typical （） William to spend all that money on the equipment and then lose interest half way through the course.

A．for
B．about
C．with
D．of

单项选择题

Steam boating emerged on the Mississippi in （）.

A．1812
B．1832
C．1852
D．1872

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