Britain has the highest ( ) of road traffic in the world―over 60 cars for every mile of road. ( 章节：6 难度：3)
- A、popularity
- B、density
- C、intensity
- D、prosperity
正确答案:B
答案解析:有
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Britain has the highest ( ) of road traffic in the world―over 60 cars for every mile of road. ( 章节：6 难度：3)
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