听力原文：M: Have you done the lab experiment for physiology yet--the one on taste？W: Yeah,

听力原文：M: Have you done the lab experiment for physiology yet--the one on taste？

W: Yeah, it was kind of fun--mapping the taste buds. Didn't you think so？

M: I'm doing it this afternoon. How long will it take？

W: It went pretty quickly--under an hour, anyway. See, first you mix up the four solutions.

M: You take water and add either sugar, lemon juice, salt, or... uh... What was it？

W: Bitter quinine.

M: That's it... uh... then what？

W: Then all you have to do is taste each sample and describe where each flavor seems most intense.

M: Is that hard？

W: Not really. One thing to remember though--not all the taste buds are on the tongue.

M: Right. I'll keep that in mind. And thanks for going over this with me. Maybe we could talk about this after I've tried it--we could get a pizza or something.

W: Great. Give me a call.

(20)

A．To see how certain chemicals produce different flavors.

B．To determine if a person can distinguish salty and sweet solutions.

C．To map the location of taste buds.

D．To count the number of taste buds.