Britain has the highest ( ) of road traffic in the world―over 60 cars for every mile of road. ( 章节：6 难度：3)_做题室

单项选择题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：
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