【正确答案】 B

【答案解析】[听力原文]
   M: Sophia, I can't find the demo materials for our solar panels, and I've got new buyers coming on Tuesday.
   W: Don't you remember? Dale had them shipped to the trade show this week. We won't have them back until next Monday.
   M: What am I going to do? I have nothing to show our customers except pictures. How am I going to show them how our products work?
   W: How about showing them the panels we installed on the roof of our building? That should impress them.
选项A错误，无法得知买家能否前去参加商贸展。选项B正确，男士手头没有太阳能面板的样品，难以向客户介绍。选项C错误，样品送去参展，而不是丢失。选项D错误，有产品可以展示。