TPO 第24套 综合写作题目重新选题
阅读材料
收起Animal fossils usually provide very little opportunity to study the actual animal tissues, because in fossils the animals' living tissues have been largely replaced by minerals. Thus, scientists were very excited recently when it appeared that a 70-million-year-old fossil of Tyrannosaurus rex (T. rex), a dinosaur, might still contain remains of the actual tissues of the animal. The discovery was made when researchers deliberately broke open the T. rex’s leg bone, thereby exposing its insides to reveal materials that seem to be remains of blood vessels, red blood cells, and collagen matrix.
First, the breaking of the fossilized leg bone revealed many small branching channels inside, which probably correspond to hollows in the bones where blood vessels were once located. The exciting finding was the presence of a soft, flexible organic substance inside the channels. This soft substance may very well represent the remains of the actual blood vessels of T. rex.
Second, microscopic examination of the various parts of the inner bone revealed the presence of spheres that could be the remains of red blood cells. Tests showed that the spheres contained iron-a material vital to the role of red blood cells in transporting oxygen to tissues. Moreover, the spheres had dark red centers (substances with iron tend to be reddish in color) and were also about the size of red blood cells.
Third, scientists performed a test on the dinosaur leg bone that showed that it contained collagen. Collagen is a fibrous protein that is a main component of living bone tissue, in which it forms a so-called collagen matrix. Collagen (or its chemical derivatives) is exactly the kind of biochemical material that one would expect to find in association with bone tissue.
听力材料
收起写作题目
收起Summarize the points made in the lecture, being sure to explain how they support/contradict specific points made in the reading passage.
答题辅导
收起1.阅读要点概括:
Theme:
The fossil of T. Rex may have remains of three kinds of materials
Keypoint 1:
The soft substance may show the remains of blood vessels
Keypoint 2:
The spheres might be the remains of red blood cells because of iron, dark redcenters and its size
Keypoint 3:
Collagen matrix might be contained in the bone issue
2.听力要点概括:
Theme:
Skeptical
Keywords 1:
Soft substance, after died, bacteria, channels, traces of organic material, left by bacteria colonies
Keywords 2:
Identical,other animals, in the same place, did not have any red blood cells, different origin, reddish mineral
Keywords 3:
Never,older than one hundred thousand years, last, explanation, come from, another source, skin, researchers