TPO43综合写作
听力无bug文本首发+高能写作范文

Hello同学们，我们的五分钟写作系列又和大家见面了，本次分享给大家TPO43综合写作的听力听写以及范文。请同学们仔细阅读下文哦！

听力文本

Unfortunately, each of the three theories about how agnostids lived has a serious weakness.

First, we know that other types of arthropods swam in the open ocean hunting their prey, however, all of those arthropods had large well developed eyes. Vision is one of the best ways for predators to track its prey. But agnostid had tiny poorly developed eyes and were sometimes completely blind. This seems to rule out the idea that they were predators. If they did chase after prey, they would have some other special sensory organ to help them to find prey. But there is no evidence of this in the fossil record.

Second, it seems unlikely that agnostids lived on the seafloor. Animals that are seafloor dwellers typically don’t have the ability to move very fast or very far. They move slowly across the seafloor and stay in localized areas rather than spreading to new areas. So typically we find each seafloor dweller species occupying a small geographic area where it had originated and nowhere else. However, many agnostid species inhabited multiple geographic areas spread across large distances. This suggest that agnostids were able to move from one area to another pretty fast. The ability to move easily across large distances would be highly unusual for seafloor dwellers.

Finally, the parasite theory. Well, one thing is typical of parasites is that their populations are not very large. Parasite populations have to stay within certain limits. Because if there were too many parasites, they would kill off the host organisms they live on. But we are pretty sure that the populations of many agnostics were in fact very large. We can tell because from many species we’ve been able to find vast amount of fossilized individuals. So the great size of agnostid populations seems rule out the theory they were parasites.

阅读文本

Agnostids were a group of marine animals that became extinct about 450 million years ago.

Agnostid fossils can be found in rocks in many areas around the world. From the fossil remains, we know that agnostids were primitive arthropods-relatives of modern-day insects. However, the fossil information does not allow paleontologists to determine with certainty what agnostids ate or how they behaved. There are several different theories about how agnostids may have lived.

Free-Swimming Predators

First, the agnostids may have been free-swimming predators that hunted smaller animals. It is

known that other types of primitive arthropods were strong swimmers and active predators, so it is reasonable that the agnostids may have lived that way as well And while the agnostids were small, sometimes just six millimeters long, there were plenty of smaller organisms in the ancient ocean for them to prey on.

Seafloor Dwellers

Second, they may have dwelled on the seafloor. Again, there are examples of other types of

primitive arthropods living this way, so it is possible that agnostids did too. On the seafloor they

would have survived by scavenging dead organisms or by grazing on bacteria.

Parasites

Third, there is the possibility that the agnostids were parasites, living on and feeding off larger

organisms. One reason that this seems possible is that there are many species of modern-day

arthropods that exist as parasites, such as fleas, ticks, and mites. The agnostids might have lived on primitive fish or even on other, larger arthropods.

写作要求：

Directions: You have 20 minutes to plan and write your response. Your response will be judged on

the basis of the quality of your writing and on how well your response presents the points in the lecture and their relationship to the reading passage. Typically, an effective response will be 150 to 225 words.

Question: Summarize the points made in the lecture, being sure to explain how they challenge the specific theories presented in the reading passage.

范文示例：

The reading passage introduced a primitive arthropod named agnostid and discussed three possible ways how agnostids may have lived while the listening passage detailed disproved these three hypotheses  have their weakness with solid evidences.

The first idea of how agnostid lived offered by reading passage is as swimming predators yet listening passage ruled out the possibility by showing the fact that agnostids are poorly sighted or even blind, the shortage of the visual ability to track prey invalidated agnostids to become predators.

The second thinking of agnostids lived as seafloor dewellers were unfortunately nullified by the large distances spreading of agnostids’ habits. Listening passage argued that seafloor dwellers typically don’t move fast or far and only stay in localized areas to against the seafloor dwellers hypothesis from reading passage.

The final guess of agnostids living ways is as parasites. But listening passage showed a clear evidence of vast amount of fossilized agnostid species to overturn the parasite theory. The supporting reason from listening is that parasite can’t be largely multiplied because of the limited host resources and large population of fossilized agnostids denied the parasite guess.

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