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听力原文：W: Shouldn't someone go to the supermarket to select some bread with the words "iron-added" on the label？
M: Don't look at me.
Q: What does the man mean？
(18)
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All experts agree with the conclusion of this experiment which is to test the proposition.
听力原文：M: Do you want to go to the cinema with us on Saturday？
W: Thanks, but I have to study for my research project. I'm taking that same anthropology course you took with Professor Gray.
M: The one on ethnographic interviewing？ Oh, good! I'm sure you'll get a lot out of it.
W: I have to admit the word "ethnography" seared me a little at first. It seems so technical. But then when she explained that it's what anthropologists do, you know, how they investigate and record aspects of a culture, it didn't seem so intimidating!
M: Yeah, it's a part of the field work anthropologists conduct and it's good to start doing that now before you become a graduate student and have to conduct large projects yourself. Who are you going to interview？
W: You know the publishing office where I used to work？ Vivian, the woman I worked for, has been a manager there for over 30 years and seen a lot of changes in the industry. I thought I'd start out by interviewing her about how the people in the office interact with each other and with outside clients.
M: The best part of that course is that it shows you that ethnographic research can also be done on a familiar ground.
W: Yeah. I got the idea for my project from reading Robert Marshal's study of office life and I realized I already had some background in that. So far, I'm really enjoying this course.
(20)
听力原文： Penury was what people called a mystery man. We had known him for over seven years, ever since he became a member of our modest club, but he had a way of keeping his private life to himself in all but the unessential details. We knew his address, though he never invited us to his home, and his age, too, but only unimportant matters of this kind. It seemed that he did not have to work for a living as we did, in our various ways. He had once hinted about an inheritance on which he managed to live comfortably. He was not, however, a man of luxurious habits: he was not especially well dressed and he did not even have a car. At the age of forty-five he was still a bachelor though. Since marriage was not a subject he ever discussed, we had no means of finding out whether he regretted not having a wife.
Penury disappeared suddenly from our circle and shortly afterwards we came to learn the first really solid facts about our mystery man. From reports that appeared in the newspapers, together with photographs of the man who was without doubt, our Mr. Penury, it was revealed that he was the most accomplished burglar in the London area; and that he had practiced this profession for many years, until he was arrested and sent to prison.
(23)
The notion that chimps transmit culture is easy to test and prove in a controlled experiment outside of a laboratory.
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