【正确答案】 B

【答案解析】[听力原文]
   W: I have a pain in my lower back. It really hurts when I stand up for a long period of time.
   M: I'll give a prescription for the pain. But I want you to make another appointment this week, so I can take X-rays.
   W: Do you have any openings on Thursday?
   Question: Where is the woman?
对话中A提到自己背疼，B准备给她开药，并希望她照X光，由此可知，女士是在诊所里。