托福TPO56听力Lecture2原文+MP3+题目+答案下载

托福TPO56听力Lecture2原文+MP3+题目+答案下载

托福TPO56听力Lecture2原文：

Listen to part of a lecture in a zoology class.

Ok, We've been talking about birds, modem birds, and their environments. But it might be interesting to say something about ancient birds, especially the one called archaeopteryx. Difficult word I know, but all it means is ancient wing. Uh The first archaeopteryx was discovered in 1861, fossilized in a piece of stone from a quarry in Germany. From a paleontology point of view, this was a real stroke of luck. Uh Not only were the fragile bones of this ancient bird extremely well preserved, and that's pretty rare for a bird, which is why we don't find very many of them in the fossil record. But the fine details of this fossil were really quite extraordinary. You could even detect impressions of the feathers on it. Amazing. Huh Yes, Mike?

Why was it that details like that showed up in this particular fossil?

well I mentioned before that the archaeopteryx fossil was found in a quarry you know where people cut stone, in this case exceptionally fine-grained limestone. And the point is the particles that this limestone was made of were so fine that the limestone preserved much of the fossil in exquisite detail, and, as 1 said, revealed impressions of details even as small as the lines and a feather. But that's pretty rare. There are not many fossils of ancient birds in general, being so fragile, much less archaeopteryx fossils. So we don't know for sure, as much as we'd like to. But there are lots of opinions. It's like, say the Mona Lisa, you guys have seen copies of that painting, right? The Mona Lisa, Well One of the great things about it is that each person who sees that painting understands it a little differently according to their own biases. You might say that the archaeopteryx is a scientific Mona Lisa.

How so?

Oh Well ornithologist who study modern birds tend to see the archaeopteryx as an early ancestor of the birds we see today. But paleontology is the ones who study fossils and forms of ancient life point out its similarity to some dinosaur species. I mean it is very different from modern birds in some important ways. 1 mean there's no beak. The tail is long and bony, the way reptiles is, rather than short and stubby, like modern birds. And it has claws at the end of what are called its wing fingers. They're generally absent in modem birds. So ornithologist think it's a bird and paleontology say it isn't?

。。。。此处省略1000字

托福TPO56听力Lecture2题目：

1. What does the professor mainly discuss?

A. Conditions that led to the extinction of the archaeopteryx. 

B. The adaptation of the archaeopteryx to its environment. 

C. Research on the archaeopteryx as an example of the typical dinosaur.

D. The importance of the archaeopteryx in the study of the evolution of birds.

2. According to the professor, why was the first archaeopteryx fossil of unusually high quality? 

A. The fossil was rot exposed to harsh weather conditions that could have damaged it.
B. Archaeopteryx bones preserve more successfully than the bones of other birds.
C. The stone in which the fossil was found was composed of very fine particles
D. The archaeopteryx was fossilized more recently than other ancient birds found in fossils.

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