单选题
专四
2014-02-24
What did FBI use as an investigative tool?
A．National Security Bills．
B．National Security Letters．
C．US Code．
D．Human Rights Bills．
参考答案
B
答案解析
B。本题考查新闻事件中的重要细节。新闻中提到，FBl使用的调查工具是国家安全密函，故选B。
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