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The Bureau of Public Security has decided to hold an inquiry to find out the cause of the
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听力原文：M: I really appreciate your filling me in on yesterday's lecture.
W: No problem: I thought you might want to go over it together. As anyway, It helps me review. Hope you're feeling better now.
M: I am. Thanks. So, you said she talked about squid？ Sounds a little strange.
W: Well, actually, it was about the evolution of sea life --a continuation from last week. The octopus and the squid descended from earlier creatures with shells. They survived by shading the shells, somewhere between 200 and 500 million years ago.
M: That's a pretty long span of time.
W: I know. That's what she said, though. To be precise: "Exactly when they emerged is uncertain ... and why is still unexplained."
M: Some squid are really huge. Can you imagine something that big if it still had a shell？
W: Actually, it's because they lost their shells that they could evolve to a bigger size.
M: Make sense. But some are really huge. I've read about fishermen that caught squid that weighed over a ton. Did she talk about how that happens？
W: Not really. But she did mention some unusual cases. In 1933 in New Zealand they caught a squid ... let's see here ... it was twenty-two yards long. Its eyes were eighteen inches across. Can you imagine？
M: Reminds me of all those stories of sea monsters.
W: Dr. Simpson thinks there are probably even larger ones that have been found, because squid are intelligent and fast-- so they can easily get away from humans. Maybe some of those monster stories are true.
(23)
A．The language laboratory.B．Travel.C．Studying in high school.D．Going to movies and wat
听力原文：M: Betty, you speak several languages, don't you？
W: Yes, I speak Spanish and French.
M: And what helped you most in learning those languages？
W: What helped me most... Well, I studied both languages in high school, and I'm still studying Spanish here at the university, but I think that travel has probably been the most help to me. You see, I've been lucky in that I've lived in Europe. Believe me, I didn't speak very well before I moved there.
M: You're right, Betly. After studying a language, practice is very useful. When you live in a country where the language is spoken, it's ideal. But, you know, some times it's difficult to make friends in a new place, even when the people are very friendly.
W: Yes, I know what you mean. Especially if you don't speak my language too well. I bad some problems when I first moved to Europe.
M: And, of course, some people are shy.
W: That's true.
M: Betty, whether or not I'm living in a country where the language is spoken, I always go to movies, and whenever I can, I watch TV or listen to the radio in the language I'm trying to learn.
W: Me too. And reading is another good way to learn. Books axe good, but I think that newspapers and magazines are even better.
M: So do I But I don't believe that it's possible to take advantage of practice opportunities without some knowledge of the language first.
W: Sine. First it's a good idea to study grammar, vocabulary.
M: ... and listening, perhaps even reading.
W: Then practice is very, very, helpful.
(20)
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
Whenever I hear a weather report declaring it's the hottest June 10 on record or whatever, I can't take it too seriously, because "ever" really means "as long as the records go hack," which is only as far as the late 1800s. Scientists have other ways of measuring temperatures before that, though — not for individual dates, but they can tell the average temperature of a given year by such proxy measurements as growth marks in corals, deposits in ocean and lake sediments, and cores drilled into glacial ice. They can even use drawings of glaciers as there were hundreds of years ago compared with today.
And in the most comprehensive compilation of such data to date, says a new report from the National Research Council, it looks pretty certain that the last few decades have been hotter than any comparable period in the last 400 years. That's a blow to those who claim the current warm spell is just part of the natural up and down of average temperatures — a frequent assertion of the global-warming-doubters crowd.
The report was triggered by doubts about past-climate claims made last year by climatologist Michael Mann, of the University of Virginia (he's the creator of the "hockey stick" graph A1 Gore used in "An Inconvenient Truth" to dramatize the rise in carbon dioxide in recent years). Mann claimed that the recent warming was unprecedented in the past thousand years — that led Congress to order up an assessment by the prestigious Research Council. Their conclusion was that a thousand years was reasonable, but not overwhelmingly supported by the data. But the past 400 was — so resoundingly that it fully supports the claim that today's temperatures are unnaturally warm, just as global warming theory has been predicting for a hundred years. And if there's any doubt about whether these proxy measurements are really legitimate, the NRC scientists compared them with actual temperature data from the most recent century, when real thermometers were in widespread use. The match was more or less right on.
In the past nearly two decades since TIME first put global warming on the cover, then, the argument against it has gone from "it isn't happening" to "it's happening, but it's natural," to "it's mostly natural" — and now, it seems, that assertion too is going to have to drop away. Indeed, Rep. Sherwood Boehlert, the New York Republican who chairs the House Science Committee and who asked for the report declared that it did nothing to support the notion of a controversy over global warming science — a controversy that opponents keep insisting is alive. Whether President Bush will finally take serious action to deal with the warming, however, is a much less settled question.
What does this passage mainly deal with？
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