听力原文：M: We are almost finished. Could you hand me the white pepper?
W: Why white pepper and not black? Aren't they the same thing?
M: Well, they are from the same plant, but white pepper is milder. I usually prefer it, it has a more settle flavor.
W: How? Aren't they from the same plant?
M: Well. ]t depends on how ripe it is when it's fixed. You surely have a lot of questions,
W; That's because you have all the answers. Did you learn about this stuff in cooking school?
M: Yeah, we study all kinds of herbs and spices.
W: So go on. It's interesting. How do we get black pepper done?
M: Ehh. Well, the pepper corn is actually a fruit. It grows on ripe. It's not really black or white. It turns from green to yellow to red as it ripens. For black pepper, you pick it when it's still a little immature, and then dry.
W: Dry in darkness?
M: Well, the skin turns dark as it dries.
W: Does that mean white pepper is pepper without the skin?
M: Exactly. It is put to dry in the sun after the skin is wrapped up. It's also mature a little longer than black pepper.
W: SO they do all that just to get a milder pepper corn?
M: Right. And for special reason. Some chefs like the idea that he keeps white sources white.
W: This green pepper corns are interesting. I never see them before.
M: Green pepper has a very distinctive flavor. Some people really like it.
W: So it must be picked really young.
M: Right. And it's not sun dry. It's either put in a liquid or a freeze dry to keep the color.
W: Well, you're quite the pepper expert, aren't you?
M: Oh, a good chef gets to know about spices.
W: I'll be judge of that. Let me taste. Hmm, you passed.
How did the man learn about pepper?
A．He read about it in a cookbook.
B．He grows his own herbs and spices.
C．He heard about it from a friend.
D．He studied it in cooking school.