The New York police department says there has been no【N1】______ against the city’s subway system, but additional security has be

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问题     The New York police department says there has been no【N1】______ against the city’s subway system, but additional security has been put in place as a【N2】______. The additional coverage includes more armed officers and sniffer dogs patrolling subway stations as well as more frequent【N3】______ and increased【N4】______ of high-traffic areas.
【N2】

选项

答案precaution

解析
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