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第一段
1 .Now listen to part of a lecture on the topic you just read about.
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第二段
1 .The evidence that the lines in the Sinosauropteryx fossil represent feathers is very strong.
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2 .The arguments of the critics are unconvincing.
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第三段
1 .First, it is unlikely that the lines are a result of the decomposition of the dinosaur's skin, because we don't see any such decomposition in the fossils of other animals buried at the same site.
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2 .In fact, the fossils of many other animals buried at the site show evidence that their functional skin structures have been beautifully preserved in volcanic ash.
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3 .The well-preserved condition of the other fossils makes it likely that the Sinosauropteryx's lines are also well-preserved functional structures, possibly feathers, and that they are not fibers caused by decomposition.
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第四段
1 .Second, the idea that the lines represent frills... well, there is an important chemical difference between feathers and frills.
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2 .Feathers contain a great deal of a protein called Beta-keratin.
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3 .Frills, on the other hand, do not contain beta-keratin.
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4 .Our chemical analyses suggest that the Sinosauropteryx structures did contain beta-keratin.
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5 .So that indicates that the structures were feathers, not frills.
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第五段
1 .Third, feathers can be used for other functions than flight and thermoregulation.
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2 .Think of a bird, like a peacock, for example.
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3 .The peacock has long, colorful feathers in its tail.
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4 .And it displays its tail in order to attract a mate.
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5 .That's a distinct function of feathers called the display function.
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6 .Recently, we have been able to do analyses on the Sinosauropteryx structures that showed us that the structures were colorful.
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7 .They were orange and white.
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8 .The fact that they were colorful strongly supports the idea that they were feathers that this dinosaur used for display.
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9 .Summarize the points made in the lecture, being sure to explain how they respond to the specific points made in the reading passage.
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