M: Ok, I get it. So if the scientists can figure out what makes the specialized cells work, maybe they can find a way to make sure the second group of cells completely fills the hole in the bone tissue every time. Thatll prevent the disease from ever occurring.

　　19. What is the discussion mainly about?

　　20. What is the function of the first group of specialized cells discussed in the talk?

　　21. What does the professor say about scientists who study the specialized cells in human bones?

　　22.According to the student, what is one important purpose of studying specialized cells in human bones?

　　Conversation 2

　　答案：CBD

　　原文：

　　M: Hi Diana, mind if I sit down?

　　W: Not at all, Jerry. How have you been?

　　M: Good. But Im surprised to see you on the city bus. Your car in the shop?

　　W: No. Ive just been thinking a lot about the environment lately. So I decided the air will be a lot cleaner if we all use public transportation when we could.

　　M: Im sure you are right. The diesel bus isnt exactly pollution free.

　　W: True. Theyll be running a lot cleaner soon. We were just talking about that in my environmental engineering class.

　　M: What could the city do? Install pollution filters in all their buses?

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