5.17 TPO24 综合写作
The group of materials, the reading passage discusses several reasons that seem to demonstrate that the Tyrannosaurus fossil will give the researchers a crucial opportunity to study the real tissue of ancient animals. However, in the lecture, the professor argues that the real tissues in the fossil do not exist by stressing some strong evidences. The first point made in the reading passage is fact that the tiny branching channels in the broken fossil may be the space where vessels existed. However, in the listening passage, the professor argues that is not blood cells, but some hollow made by bacteria. After the animals died, bacteria lived inside the soft tissue and the area is left by bacteria colonies. The second point made in the passage is that the spheres in the inner bone may be revealed as remains of red cells. But the professor says that the remains of animals nearby contain the same kinds of spheres. However, these animals do not contain red cells. Thus the sphere can not be red cells. It might be the sediments of mineral. The third point in the reading passage is that the dinosaur leg bone contain collagen, a protein whic is a main component of living bone tissue. The professor explains that it might be something else. People do not find any remains containing collagen that exist earlies than 100,000 years ago. Thus, the professor explains tha may come from other source like the skin of researchers. |