A、The same person. B、Friends of the speaker. C、Psychology professors. D、Fictional characters. A

M: Hi, Helen, what do you think of our class in children’s literature?
W: It looks pretty good. I was surprised to see you in there. Are you also majoring in elementary education?
M: No, I’m not, but as a psychology major, I can use this to fulfill the requirement in developmental psychology.
W: Have you finished the first assignment yet?
M: Not yet. I just bought the books today. How bout you?
W: I started this afternoon. It’s great fun reading those wonderful children’s stories by Dr. Thews.
M: Dr. Thews? I don’t remember seeing his name on the reading list.
W: His full name is Theodore Thews Gaisell. That’s how it’s listed in the bibliography. Dr. Thews is his pen name.
M: I loved reading those stories as a child.  It’ll be interesting to read them now from a different perspective. I guess it’s give me a good idea on how children think.
W: Those stories are also great for classroom use.
M: How is that?
W: Well, take a typical Dr. Thews’ book like The Cat in the Hat. It was a controlled vocabulary of only 200 words.
M: So that means the children get lots of practice in using a small number of words over and over.
W: Exactly. In fact, The Cat in the Hat was written primarily to show how a controlled vocabulary reader could also be interesting and fun.
M: Well, it sounds like all these courses are also going to be interesting and fun. I think I’ll get started on this reading list tonight.