【正确答案】 D

【答案解析】原文：W: Hi. May I help you?M: Yes, I’d like to change some US dollars into renminbi please. W: Sure. How much would you like to change? M: 600 US dollars to renminbi. W: Very good. May I see your passport? M: Sure. Here you are. W: How would you like your bills? M: In fifties, please.18. What does the man want to do?19. What does the woman ask the man to show?信息明示题。对话中，女士询问男士需要什么帮助，男士回答说想把一些美元兑换成人民币。由此可知，男士想做的事情是D“兑换一些钱”。A“开立一个银行账户”、B“预订一个宾馆房间”和C“下一个订单”均与对话内容不符，因此可以排除。