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A．It is a serious threat to its competitors.B．It is not powerful enough to affect the
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听力原文：M: Excuse me. Are you going to buy concert tickets？
W: Yes, I am. So are all these people in front of me.
M: Have you been here long？
W: About 45 minutes. I've moved forward a total of about 3 feet in that time.
M: You are kidding.
W: Not at all. There was a couple up ahead of me who got so disgusted they finally, gave up and left. They said they'd been waiting for more than an hour.
M: Terrific. Does anyone know what's causing the delay？
W: If so, no one has let us know. It could be that there aren't enough people selling tickets this afternoon. Or maybe their computer is down. I'm sure the concert hasn't been cancelled.
M: I just hope they don't run out of tickets before I get up there.
W: That really would be annoying, wouldn't it？
M: I guess I should have come before lunch or has it been like this all day？
W: Apparently it has. In fact, before I came I tried calling to charge my tickets over the phone, just to avoid this long wait. But they are not taking phone orders, or checks, or credit cards. It's cash or nothing, and you have to come in person.
M: Well, there are two more hours before the tickets office closes. Tickets for a good concert are worth waiting for. So I think I'll just make myself comfortable.
(20)
听力原文：M: Good morning. Say, do you know what the assignment is for our term paper in history？
W: Sure. Weren't you in class on Monday？ That's when it was given out.
M: No, I missed that class. Was there a handout？
W: No, the instructor just wrote the assignment on the board.
M: Could I copy the assignment from your notes？
W: You could, ff I had copied it all down; but I just wrote down the part that I wanted.
M: Oh, no.
W: You see, there were four choices of topics ior the term paper; but, when I saw them, I knew which one I wanted so I didn't copy the others down.
M: Can you remember any o'f the others？
W: Let's see. There was one about World War I, something about it, but I don't remember what, and there was one called "the idea of progress in the nineteenth century."
M: And what was the last one？
W: I can't remember. My mind is a complete blank. Maybe you can ask someone else.
M: Yes, I will. Anyway, those are certainly broad topics.
W: Yes, but you van focus on a special area within them. Which one would you take？
M: Of course, I don't know what the last one is, but of these three, I think I'd take "the idea of progress."
W: That's very abstract.
M: Yes, but it's one of my interests and I've read a lot on the subject. I've never written a term paper on it though.
W: Me neither. I haven't even read about it. Are you going to class on Wednesday？
M: Yes.
W: Maybe he'll write it on the board again.
M: I hope so. Good luck with your paper.
W: Same to you.
(23)
The Qin Dynasty lasted for 49 years and the Han Dynasty lasted for 14 years.
In science the meaning of the word "explain" suffers with civilization's every step in search of reality. Science cannot really explain electricity, magnetism, and gravitation; their effects can be measured and predicted, but of their nature no more is known to the modern scientist than to Thales who first looked into the nature of the electrification of amber, a hard yellowish-brown gum. Most contemporary physicists reject the notion that man can ever discover what these mysterious forces "really" are. Electricity, Bertrand Russell says, "is not a thing, like St. Paul's Cathedral; it is a way in which things behave. When we have told how things behave when they are electrified, and under what circumstances they are electrified, we have told all there is to tell." Until recently scientists would have disapproved of such an idea. Aristotle, for example, whose natural science dominated Western thought for two thousand years, believe that man could arrive at an understanding of reality by reasoning from self-evident principles. He felt, for example, that it is a self-evident principle that everything in the universe has its proper place, hence one can deduce that objects fall to the ground because that's where they belong, and smoke goes up because that's where it belongs. The goal of Aristotelian science was to explain why things happen. Modem science was born when Galileo began trying to explain how things happen and thus originated the method of controlled experiment which now forms the basis of scientific investigation.
The aim of controlled scientific experiments is ______.
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