TPO65听力Lecture1原文+MP3+题目+答案下载

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TPO65听力Lecture1原文+MP3+题目+答案下载

TPO65听力Lecture1原文：

Listen to part of the lecture in a biology class.

Until about 30 years ago, scientific opinion was pretty much unanimous in thinking that dinosaurs were cold-blooded creatures, and not warm blooded like mammals and birds.What are these terms cold- and warm-blooded mean?

Well, they are imprecise terms, a little bit inaccurate, but for the sake of consistency, I’ll continue to use them.

Warm-blooded animals, or technically, endothermic animals, are animals that use their own metabolism to maintain a relatively high, generally constant body temperature. They generate their own heat, whereas cold-blooded animals, uh, technically called ectothermic animals, cold-blooded animals rely on the environment primarily to regulate their body temperature. And their body temperature can actually vary a great deal depending on the temperature surrounding them.

Now, as I said, mammals and birds are warm-blooded creatures, and we being mammals, you’re familiar with, you know, your body stays pretty much the same temperature all the time, whereas if you’ve ever seen, say, snakes or lizards you know, basking in the sun on the rock, you can see the characteristic feature of a cold-blooded creature that is using the environment to help regulate its body temperature.

As I said, until about 30 years ago, dinosaurs were, because they seem to most closely resemble reptiles, they were thought to be cold-blooded. Then about 30 years ago a number of scientists began to suggest the possibility that dinosaurs might in fact be warm-blooded. This was very exciting for a variety of reasons. Warm-blooded creatures are closer to us. They are more active. They move faster. They can live in a wider range of environments than cold-blooded creatures. So a lot of scientists kind of got on this bandwagon for warm-blooded dinosaurs. But unfortunately, a lot of the evidence for dinosaurs possibly being warm-blooded is indirect.Among the pieces of evidence is that the fossilized remains of dinosaurs have shown that certain kinds of dinosaurs had feathers.

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