【正确答案】 B

【答案解析】原文：W：Youth Travel Agency! What can I do for you, sir?M：I’ve read your advertisement about the tour to China. I am calling to inquire about it.Q：What does the man want to know?题干问关于女士的假期,我们知道些什么。通过对话内容可知,女士说自己- -直在博物馆做志愿者。故选B。