【答案解析】[解析] 本题考查细节理解。根据首段末句：“he owes his success as a monetary policymaker to his ability to sniff out threats to the economy and manipulate interest rates to dampen the dangers he perceives(Greenspan总能借助利率的调整消除他所感觉到的对经济的威胁，即能在威胁出现之前“及时的”行动)”可知，[B]为正确答案。