A、Travel. B、Mystery. C、History. D、Poetry. B预览选项可知，本题与科目有关。对话中提到Mystery和poetry，因此排除A)和C)。而本题问的是男士发现了哪种书，根据对话内容可知应选B)。poetry book是

W: I enjoy going through second-hand bookstores, don’t you? It’s interesting to see what people used to enjoy reading. Did you see this old book of children’s stories?
M: Some of these books aren’t so old though. See? This Mystery was published only six years ago. It cost 75 cents. You can’t beat that.
W: Hey, look at this!
M: What! Are you getting interested in the 19th century poetry all of a sudden?
W: No. Look here. Someone gave this book as a present and wrote a note on the inside of the front cover. It’s dated 1893. Maybe it’s worth something.
M: Everything on that shelf is worth 50cents.
W: But if this is the signature of someone who is well known, it might bring a lot more. I hear Shakespeare’s signature is worth about a million dollars.
M: Oh? I can hardly read what that one says. Who wrote it?
W: The name looks like "Harold Dobson". Maybe "Dobbins"? Wasn’t he a politician or something? I’m going to buy this book and see if I can find a name like that in the library.
M: Good luck. Your poetry book may make you rich, but I’ll bet my 75-cent Mystery is a good buy.
Questions 19 to 22 are based on the conversation you have just heard.
19. Where is the conversation taking place?
20. What kind of book did the man find?
21. Why does the woman mention Shakespeare?
22. What does the woman intend to do later on?