单选题 According to recent U.S. Statistics Yearbook, Americans spend $16 billion a year on credit cards and there are already 590 million in ______.
  • A. preparation
  • B. communication
  • C. administration
  • D. circulation
【正确答案】 D
【答案解析】preparation“准备，预备；预习”；communication“交流，交通；通讯”；administration“管理；行政；行政机关”；circulation“(货币、消息等)流通；传播”，如：in circulation“在流通中；在传播中”，put the new coins into circulation“发行新货币”。根据题意指美国已经有5.9亿张信用卡在流通中，所以答案应选D。