听力原文：M: Hi, Sue.W: Hello, Jill, how are you？M: I'm fine. Did you watch the TV special

听力原文：M: Hi, Sue.

W: Hello, Jill, how are you？

M: I'm fine. Did you watch the TV special about barnacles last night？

W: No, I missed it. What did you learn about them？

M: They glue themselves to rocks in the ocean, shortly after birth. They also stay in the same place forever.

W: Right, have you ever tried removing one of these things？ It would be easier to chip the rock away than to get the barnacles off.

M: Exactly, and that's why scientists are trying to figure out what the barnacles glue is made of. It's considered one of the strongest adhesives in nature.

W: And it would have the advantage of being able to work on wet surfaces too.

M: Precisely, and because it's natural protein, it probably wouldn't be harmful to people like so many synthetic glues in use today.

W: Think of all the ways in which doctors and dentists could use such a glue to mend broken bones and fasten false teeth.

M: There could be countless uses. Scientists hope to learn soon exactly how the glue is made, so that people can make use of it.

W: That's good news for the general public. I hope it won't take long for the new glue to be put into use.

(23)

A．The reproductive cycle of barnacles.

B．A new source of protein.

C．Types of sea animals.

D．The adhesive quality of barnacles.