Paragraph Eight 　A top U.S. official announced plans to establis

Paragraph Eight 　A top U.S. official announced plans to establish a review group to look at the government’s intelligence collection methods and surveillance capabilities. Once established, the group will brief its interim findings to Obama within 60 days of its formation and provide a final report with recommendations in due course. 43. U.S. to e______ intelligence collection methods.
【正确答案】：efficient
【题目解析】：该段落描写了美国政府计划建立有效观察组以便找到有效地找到收集情报的方法。题干的意思是“美国有效的情报收集方法”，缺少efficient，“有效的”一词。