【正确答案】 C

【答案解析】原文：W: Mr. Smith, what’s wrong with your smartphone?M: It wouldn’t give sound when phone calls come in.W: Have you checked its sound system?M: Yes, the sound system is OK.W: When did you buy the smartphone?M: Three days ago.W: In that case, you can return it to us or change it for a new one.M: I want to change it for a new one.W: OK. Have you brought the receipt with you?M: Yes, here you are.17. What has happened to the man’s smartphone?18. When did the man buy the smartphone?19. What does the woman ask the man to show?信息明示题。对话中，对于出现问题的手机，男士表示愿意更换新机。女士询问男士是否携带了发票；男士回答说带了，并且递给了女士。由此可见，女士要求男士出示发票，所以本题的答案为C)“他的收据”。对话中并没有提到女士要求男士出示A)“他的身份证”或者B)“他的名片”，也没有提及要他出示D)“他的地址”，因此均可以排除。