托福TPO70听力Lecture1原文+题目+答案+MP3音频下载

托福TPO70听力Lecture1原文+题目+答案+MP3音频下载

以下为托福TPO70听力Lecture1原文：

Listen to part of a lecture in a biology class.

I'd like to talk to you today about a principle of evolutionary biology that was first proposed in the 19th century by an American scientist named Edward Cope. Cope made a scientific examination of fossils and thought he noticed a pattern of increasing sizes within species. He proposed a principle which is usually called cope’s rule. What coke said was that evolution was directed towards larger size creatures and this can be seen in many perhaps even in most fossil lineages.Fossil lineages,We talked about that before. they are chronological charts of fossils of a specific species ,char over time. These lineages allowed cope to compare fossils of different ages, some millions of years older than others.

And cope notes a tendency toward increasing size. Now there are some obvious advantages to being bigger even within the same species, like being bigger can be a deterrent to predator so you're less likely to be eaten, more likely to survive if you happen to be big.In certain species, bigger animals are more fuel efficient.They need less food per pound to keep themselves going Although they need more food overall because they are big,it's the same thing with marine animals,in order o maintain body heat ,larger whales need less food per pound than smaller w also in most spec, larger females tend to produce more eggs increasing their chances of passing on their genes.

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托福TPO70听力Lecture1题目：

(1)、(单选题) What is the main purpose of the lecture'?

A.To present a theory and an argument that refutes it

B.To compare the evolution of different species of large animals

C.To show how a previously discredited theory was later proved to be true

D.To show how researchers can use different evidence to reach the same conclusion

(2)、(单选题) What principle does Cope's Rule try to promote?

A.That larger animals are less likely to survive natural disasters than smaller animals

B.That marine species tend to be more fuel efficient than land species

C.That species seem to grow larger the longer they survive on Earth

D.That there is no limit to how large or small a particular species can be

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