托福TPO39綜合寫作真題解析

TPO，即toefl Practice Online的首寫字母，就是托福在線練習(xí)的意思，TPO可以為考生提供全真的模擬考試環(huán)境和過(guò)往真題，而TPO題庫(kù)也是有著不斷的更新。在托福寫作備考的過(guò)程時(shí)候，大家往往會(huì)把更多的精力放在托福獨(dú)立寫作的準(zhǔn)備中。但是，想要沖刺的托福寫作的高分，綜合寫作也是我們必須要沖過(guò)的一個(gè)難關(guān)。今天，小編就為大家?guī)��?lái)托福TPO39綜合寫作真題解析。

托福TPO39綜合寫作真題解析： 【在線咨詢】

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.

At the end of the Triassic period 200 million years ago, there was a mass-extinction event that caused the extinction of more than half of all living species. It was this extinction event that allowed dinosaurs to become the dominant species for the next 145 million years. We do not know exactly what happened that eliminated so many species in a relatively short period of time, but there are several possible explanations.

One theory involves the decline of sea levels. Near the end of the Triassic period, sea levels were fluctuating. When sea levels fall, the habitats for ocean populations that live in the shallows and land species that live on the coast are destroyed. The destruction of coastal and shallow-ocean species would have had a profound effect on food chains worldwide, leading to mass extinctions.

Another theory involves massive climate cooling. The end of the Triassic period was marked by widespread volcanic activity. The volcanoes released large amounts of sulfur dioxide (S02). A rise in atmospheric S02 is known to cause a lowering in global temperatures. Such climate change could have devastated many species and led to the extinctions.

The third theory involves an asteroid strike. Asteroids (objects from outer space) occasionally collide with Earth. When an asteroid hits Earth’s surface, it often displaces large amounts of soil and crushed rock, leaving behind a depression, or crater. The displaced debris is thrown up into the atmosphere where it can block out sunlight for many months or even a few years. A sufficiently massive asteroid impact at the end of the Triassic period may have blocked sunlight long enough for most plants to die and many animal species to then starve.

托福綜合寫作范文：  【在線咨詢】

This set of material focus on the debate over explanations about mass-extinction event. The author proposes three possible theories but the speaker retorts them one by one.

First, the passage says that the decline of sea level will cause coast species to distinct and thus lead to the elimination of other species. However, the lecturer indicates that sea level indeed fluctuates during this period, but it actually goes down at a very low speed. This change takes millions of years. The period is so long that it is certainly enough time for earth species to adapt themselves to it. Therefore, the first idea of the essay is rebutted.

Second, the author demonstrated that frequent volcanic activity will release too much sulfur dioxide which can lead to earth cooling. Nevertheless, the speaker argues that sulfur dioxide presents for few years in earth’s atmosphere, but it can combine with water and become rain. Consequently, the sulfur dioxide leaves the air so it is impossible for it to stay long enough in the atmosphere and cause apparent temperature drop.

Third, the writer holds that asteroids collide with the earth produces large amounts of debris which block sunlight, finally leading to the death of plantations and the starvation of animals. While the speaker says that it is found the asteroid strike happened about 12 million years before the mass-extinction. It is too long before the sudden elimination of earth species so probably has nothing to do with this great collision. Thus overturns the third viewpoint in the essay. (254 words)

》》更多托福TPO39寫作真題解析，可撥打免費(fèi)電話咨詢400-618-0272

您還可能關(guān)注：

相關(guān)閱讀：

如有更多問(wèn)題歡迎致電新通教育：400-618-0272，登錄