托福tpo模考软件下载【一键安装】.docx

智课网TOEFL备考资料托福tpo模考软件下载【一键安装】 摘要： 托福tpo模考软件下载，托福TPO里面的真题全部是过去曾经考过的托福真题，在我们托福备战过程中起到非常重要的作用，吃透托福TPO能够让我们提前了解托福难易度、把握托福考点、了解托福真题的相关特点，下面是托福tpo模考软件下载链接，需要的考生看过来。 本文为你提供 托福 tpo模考软件下载链接，托福tpo模考软件让你随时随地都能练习托福真题，下面我们就先来看看托福tpo模考软件下载的内容。 托福tpo模考软件下载内容：TPO 24 写作 阅读材料： 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. 动物化石很难帮助人们研究动物的软组织，这是因为化石里面的动物活性组织大部分都被矿物质代替了。最近，发现一个 7 千万年前的霸王龙化石中可能存在真正的动物软组织。这令科学家们非常兴奋。科学家小心翼翼地打开了霸王龙腿骨的时候，发现里面存在着可能为血管、血红细胞和胶原蛋白基质的物质。 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. 首先，打开腿骨化石之后，科学家发现了内部有一些管状分支，这些管状分支可能是骨内血管存在的地方。令人兴奋的是在这些管状分支中存在着柔软的有机物质。这些柔软的物质可能是霸王龙真正血管的遗留痕迹。 . 托福tpo模考软件下载内容：TPO 24 写作 例文(仅供参考) The reading passage points out three evidences that indicate the existence of actually tissue in dinosaur fossil. However, the professor doubts the accuracy of these evidences. In fact, he offers some alternative explanations for the substances found in the fossil. First and foremost, he challenges the existence of blood vessels. Instead, he points out that bacteria may occupy the hollows inside the bones. Therefore, it is highly possible that the soft substance in the branching channels of the bone is the moist residue of bacteria, rather than blood vessels of the dinosaur. Moreover, the professor casts doubt about the red substance in sphere, which according to the reading passage is the remain of red blood cells. In fact, the professor claims that this red substance was also found in some other animals, which lived in the same place but had no red blood vessels at all. The professor argues that the sphere can be pieces of red minerals. Additionally, the professor doubts the existence of collagen in the fossil. On the contrary to the reading passage, he points out that the earliest collagen that has ever found is in fossils 100000 ago. It is unlikely for collagen to last for more than 70 million years.As a result, the professor suggests that the collagen may come from recent sources, such as the skin of re