参考答案和解析
正确答案：
B
解析：
特定信息的找寻和判断。关于美国中央银行的目标，录音中指出“Its purpose is to control the flow of money in the economy, to supervise banking activity and to protect the financial system”，表明其目标是控制货币流量，监督银行业活动，并且保护金融体系。分别对应选项A，B和D的内容，唯有C项（制造与发行纸币和硬币）未曾提及。
【录音原文】
America’s Central Bank is part of a larger financial system called the United States Federal Reserve System. It is not a single bank, but a banking system with operations that are both public and private. Its purpose is to control the flow of money in the economy, to supervise banking activity and to protect the financial system.
