听力原文：W: I've been reading about new healthful food which you can eat in your leisure time and will not put oil weight. It's made from fish. Have you heard anything about it？
M: No. I haven't. (19)But I don't like fish very much anyway.
W: Don't worry. Although it is made primarily from fish, it actually doesn't have a fishy taste. In fact, it can be flavored with tomato, cheese, or chocolate for instance.
M: That sounds good. (20)I suppose this product will be low calorie and high protein, like, eh, health food.
W: (20) Yes, you could call it that. And it has a long shelf life, so it won't spoil quickly. It is also easy to digest and can be made from types of fish that usually aren't eaten, or from high-grade fish byproduct.
M: Hm… Have you got any samples？ I might be willing to try the cheese flavored variety.
W: No, none of this seems to be available yet. As I understand it, (21) this fish food probably won't be in the stores for another couple of years, so you have a while to get used to the whole idea.
M: A couple of years, huh？ It may just take me that long. But thanks for telling me about it.
(23)

A. He is very interested in it.
B. He is indifferent to it.
C. He is surprised about it.
D. He is angry with it.