听力原文：W: Do you like to run?
M: Yeah, when the police are chasing me.
W: You know Kerron Clement?
M: Who?
W: Kerron Clement. He just broke the world record in the 400 meter.
M: Right.
W: Did you know that he's only 19 years old? Did you see it on the news?
M: I heard a bit about it.
W: Okay. Well, let's look at the rest. This Florida sophomore ran the 400 meter in 44.57 seconds at the NCAA Indoor Track and Field Championships. He broke the mark of 44.63 seconds set by Michael Johnson in 1995.
M: Hey, I'm fast. I could beat him any day.
W: Yeah, only if there is a ＄ 20 bill blowing in the wind in front of you. Let's get back to the story now. Clement is from Trinidad and Tobago and moved to the United States when he was 13. He won the NCAA championship in the 400-meter hurdles and then won the world junior championship in the same event. At the junior championships, Clement competed for the United States after earning his U.S. citizenship last summer. He probably could have gone to the Olympics for Trinidad and Tobago last year, but preferred to become an American. Why do you think he wanted to become American?
M: Probably America is his new home and it has better living conditions than back home.
W: Yeah, something like that. He said he loves competition and he wants to train with the best in the world, the Americans.
Why does the professor mention ＄ 20 bill?
A．To confirm that the student is capable of beating Clement.
B．To show how sincere he is.
C．To give an example of how to run fast.
D．To make a joke about the student's comment.

单项选择题【C1】（）

A．for
B．of
C．with
D．by

单项选择题SECTION B PASSAGESDirections: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.听力原文： Good afternoon, class. Today, we'll continue our discussion of modern American architects. Now, let's review the three main elements that any architect must consider when designing a building. One of the elements is function. An architect must consider the function of a building, whether the design hinders or enhances the use of the building, whether the design allows for easy heating and cooling, plumbing, and electrical wiring. Appearance, the second element is appearance. Does the building fit in with its surroundings? Is it pleasing to look at or an eyesore? Its appearance is quite an important element. The last one is durability. An architect must consider a building's durability, whether the materials will withstand wear from weather on the outside and from use on the inside. Now we'll move on to discuss the architect. The man in this photograph is Frank Lloyd Wright. Frank Lloyd Wright has been called the greatest figure in modern American architecture because of his influence on function, appearance, and durability. I've placed several books on reserve in the library. Some of the books contain pictures and diagrams of Wright's work, and there's also an in-depth and...um...informative biography of Wright. The reserve material in the library is optional, but you may want to spend some time with it in order to have the best understanding possible of Frank Lloyd Wright and his work.What is the professor mainly discussing?A．The importance of function in the design of a building.B．A number of modern American architects and the important elements in their work.C．Three main elements that architect must think when designing a building and a famous architect.D．The important characteristics of the designs of one specific architect.