听力原文：M: Did you watch undersea Discover), last night？W: No, I missed it. Did you？M: Ye

听力原文：M: Did you watch undersea Discover), 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 undcrwater.

M: That's one. reason scientists are-trying to figure out what their glue's made of. It's one of the strongest adhesive in nature, and it's a natural protein, so it probably wouldn't be harmful like some synthetic glues.

W: Really？

M: Yes. 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.

(23)

A．The reproductive cycle of barnacles.

B．A new source of protein.

C．Types of sea animals.

D．The adhesive quality of barnacles.