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

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

admin2014-08-13  62
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.
【N4】
选项
答案surveillance
解析
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