听力原文:M: Did you watch" Undersea Discovery" last night?W: No, I missed it. Did you?M: Y
听力原文:M: Did you watch" Undersea Discovery" last night?
W: No, I missed it. Did you?
M: Yeah. It was pretty good--it was about barnacles.
W: Hmm.
M: You know how they stick themselves to stuff in the ocean-like rocks or boats?
W: Uh-huh.
M: Well, they do that when they're young, and then they stay in the same place forever.
W: It figures. Have you ever tried removing one of those things? Last summer I tried to scrape some off a pier—I had to give up after a while. You'd think they wouldn't be able to stick like that underwater.
M: Yeah. These biomedical researchers were talking about its possible uses. Orthopedists could use it for mending broken bones; or it could be used in dentistry.
W: I wish I'd seen that.
(20)
A.The reproductive cycle of barnacles.
B.A new source of protein.
C.Types of sea animals.
D.The adhesive quality of barnacles.