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．intensity
C．density
D．prosperity
<上一题 目录 下一题>
热门 试题

单项选择题
We ______ our breakfast when an old man came to the door.
A．just have had
B．have just had
C．just had
D．had just had
单项选择题
The European Union countries were once worried that they would not have ______ supplies of petroleum.
A．proficient
B．efficient
C．potential
D．sufficient
相关试题