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A．whereB．whenC．which

A. where
B. when
C. which

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听力原文：W: Dr. Smith. I need to ask you about something in Chapter 12. Well it talks about erosion and the deposit of sediment on the deep sea floor, but I'm confused, because, well, for that to happen there would have to be some kind of force down there moving the mud or sand or whatever, right. But l thought there weren't any waves or currents that deep in the ocean.
M: That's not exactly true. It's true that deep down on the ocean floor we won't have the same kinds of currents we find in shallower parts. But we do find what we call turbidity currents. This wasn't in the book but the term came up in class. Do you remember what it means？
W: Umh, turbidity currents？ Oh, yeah! Isn't that when sediment like sand or mud gets stirred up and mixes with water and then this mixer kind of flows through the water around it, right？
M: Good!
W: Umh, but I thought that only happened in rivers.
M: Well, yes. This does occur in rivers, but we see turbidity currents deep in the ocean as well.
W: But how do they get started there？
M: Earthquakes mostly, when an earthquake occurs under water, it throws up tremendous, amounts of mud or sand that becomes suspended in a layer of water near the bottom of the ocean. This layer is so much denser and heavier than other ocean water that it flows right down the slopes o f the ocean floor and gains more and more speed as it moves along. Then it's just like the winds blowing across the desert picking up sand from one place and moving it along and finally dropping it somewhere else.
(23)

A. Earthquake.
B. Turbidity currents.
C. Erosion and the deposit of sediment on the deep sea floor.
D. Waves or currents that deep in the ocean.

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A．Because it stretches our vision and challenges our problem-solving ability.B．Because

A. Because it stretches our vision and challenges our problem-solving ability.
Because it helps to develop insight into the essence of life.
C. Because it helps us learn how to think in an analytical way.
D. All of the above.

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A．Look at the jobs in the classifieds in the local paper.B．Search on the Internet and

A. Look at the jobs in the classifieds in the local paper.
B. Search on the Internet and send out his resume by e-mail.
C. Print out his resume and send it to the relevant companies.
D. Both A and C

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听力原文：M: I agreed with your proposal at the meeting this morning, it was a good one.
W: You should back me up then, when I need it.
Q: What does the woman mean？
(15)

A. Her back hurt during the meeting.
B. She agreed that it was a good meeting.
C. The proposal should be sent back.
D. His support would have helped this morning.

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A．whereB．whenC．which