TF写作真题第046套（nt019）

NT_019

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综合写作NT 019音频

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综合写作

The triceratops was a giant plant-eating dinosaur that lived in what s now western North America. The triceratops had a massive head that featured three horns and a large bony frill-or bone plate extending from the rear of its skull. Paleontologists have proposed a number of theories about the function of the triceratops frill.

According to one theory, the two long horns above the eyes of the triceratops Were used to attack other triceratopses, and the frill protected the animals head and neck. Some scientists who support this theory point to holes and other damage that are frequently present in triceratopses’ fill. They claim that these are evidence that is now western North America. The triceratops had a massive head that featured three horns and a large bony frill-or bone plate extending from the rear of its skull. Paleontologists have proposed a number of theories about the function of the triceratops frill.

Another theory about the purpose of the frill is that it was used to attract mates during mating displays. Many animals use bright colors o demonstrate good health and physical maturity to potential mates.The frills of triceratopses have numerous large lines or grooves indicating that the frills contained blood vessels. When excited, the triceratops may have sent additional blood to these vessels in the frill causing the frill to grow brighter in color. The frills bright color may have played an important role in mating displays.

Finally, it has been proposed that the frill existed as support for long, powerful jaw muscles that aided in chewing. Triceratopses had beaks filled with sharp, scissor-like teeth that are unusual for plant eating animals. This fact has led some scientists to believe that triceratopses must have eaten food that was tough and difficult to chew. Consequently, triceratopses needed the increased chewing power they gained from enlarged jaw muscles that extended into the frill.

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