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A．She couldn't find her watch.B．She feels bad about being late.C．She forgot what time

A. She couldn't find her watch.
B. She feels bad about being late.
C. She forgot what time the library closed.
D. She had never agreed to meet the man.

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A．They have difficulty identifying these cells.B．They aren't sure how these cells work

A. They have difficulty identifying these cells.
B. They aren't sure how these cells work.
C. They've learned how to reproduce these cells.
D. They've found similar cells in other species.

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A．The shirt belongs to her sister.B．The shirt was purchased during a trip.C．She bought

A. The shirt belongs to her sister.
B. The shirt was purchased during a trip.
C. She bought a similar shirt for the man.
D. The shirt is her favorite color.

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听力原文：M: Hi Diana, mind if I sit down？
W: Not at all, Jerry. How have you been？
M: Good. But I'm surprised to see you on the city bus. Your car in the shop？
W: No. I've 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: I'm sure you are right. The diesel bus isn't exactly pollution free.
W: True. But they'll be running a lot cleaner soon. We were just talking about that in my environmental engineering class.
M: What's the city gonna do？ Install pollution filters of some sort on their buses？
W: They could, but those filters make the engines work harder and really cut down on fuel efficiency. Instead they found a way to make their engines more efficient.
M: How？
W: Well, there is a material called the coniine oxide. It's a really good insulator. And a thick coat of it get sprayed on the certain part of the engine.
M: An insulator？
W: Well, yeah. Actually, what it does is reflect back the heat of burning fuel. So the fuel will burn much hotter and burn up more completely.
M: So a lot less unburned fuel comes out to pollute the air, right？
W: Yeah, and the bus will need less fuel. So with the savings on fuel cost, they say this will all pay for itself in just six months.
M: Sounds like people should all go out and get some this stuff to spray their car engines.
W: Well, it's not really that easy. You see, normally, the materials are fine powder. To melt it so you can spray a coat of it on the engine parts, you first have to heat it over 10,000 degrees and then, well, you get the idea. It's not something you or I be able to do ourselves.
(35)

A new fuel for buses.
B. The causes of air pollution.
C. A way to improve fuel efficiency in buses.
D. Careers in environmental engineering.

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A．The book was very interesting.B．He hasn't read the book yet.C．The book is too long.D．

A. The book was very interesting.
B. He hasn't read the book yet.
C. The book is too long.
D. He doesn't usually read spy thrillers.

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A．She couldn't find her watch.B．She feels bad about being late.C．She forgot what time