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单选题
Sometimes patrolling officers on buses are unnoticed because _____.
A

they look like fare inspectors

B

they don’t wear uniform

C

they are polite to passengers

D

they often take a back seat


参考答案

参考解析
解析:
细节题。由文章第三段第三句“Sometimes officers patrol out of uniform-one could be on your next bus”可知,警察们有时巡逻不穿制服,也许你在乘公车时,旁边坐的就是一个警察,B项正确,属于原文的同义转述。A项语意矛盾,Hiawatha轻轨上的检票员就是巡警;C、D项无中生有,在文中并没有提及。
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