22. According to the student, what is one important purpose of studying specialized cells in human bones?
【解析】学习这些人类骨头中的特殊细胞的重要目的是为了学习如何预防骨头疾病。从男士的这一句话中可看出:Thatll prevent the disease from ever occurring. 这样可以在疾病发生之前预防疾病,可见符合题意。
Conversation Two
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?
W: They could, but those filters make the engines work harder and really cut down on the fuel efficiency. Instead they found a way to make their engines more efficient.
M: How?
W: Well, there is a material thats a really good insulator. And a thin coat of it gets sprayed on the certain part of the engine.
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