单项选择题

Britain has the highest ______ of road traffic in the world--over 60 cars for every mile of road.

A．popularity
B．density
C．intensity
D．prosperity
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单项选择题
The purpose of a ______ is to cut down imports in order to protect domestic industry and workers from foreign competition.
A．tax
B．toll
C．fee
D．tariff
单项选择题
If ______ and lodging are included in educational fees, a university student in the U.S. will need approximately $10,000 a year.
A．meal
B．board
C．food
D．provisions
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