TOEFL TPO -1 Writing Task 1 Sample: Sure. There are some concerns about iron fertilization. I'm going to address the concerns and explain why I think iron fertilization is a very good idea. First, it's true that iron fertilized phytoplankton in the experiments did not absorb a lot of carbon dioxide. However, these studies are unconvincing, because they were too short. Most of them lasted less than a month. But it turns out that phytoplankton plants live for 2 or 3 months and absorb most carbon dioxide in the last month of their lives. So phytoplankton may not be efficient absorbers of co two during the first month. But the efficiency would probably greatly increase in the second and third month. Second, it's true that phytoplankton may occasionally produce too many environmental toxins in certain areas. But this problem can be easily addressed if we just stop fertilizing those areas with iron. If we stop fertilizing the areas, the phytoplankton will not have enough nutrition and will quickly start dying out. As a result, the production of the toxins will quickly decline, and there will be no permanent damage. Finally, it's true that we don't really know the long term effects of iron fertilization on ocean ecosystems. But this is a risk we may have to take. Because if we don't, we will be facing a much greater risk. The rapid changes to earth's climate will probably cause much greater harm to the ocean ecosystems than iron fertilization ever could. We have to act now in a big way to reduce carbon dioxide. If we want to slow climate change, and iron fertilization is one of our best bets it's exceeding.

1.子项得分 任务完成度：4 组织：4 连贯性和衔接：4 语言使用：3

2.预估分数

25. 3.任务完成度

这篇文章在任务完成度方面做得不错，基本上涵盖了阅读和听力材料中的观点。但是，有一些建议可以帮助提高文章的质量。首先，在引用听力材料时，可以更具体地描述教授的观点，以便让读者更好地理解。其次，在总结反驳阅读材料的论点时，尽量避免重复使用相同的词汇和表达。

示例1： 原文：“The speaker argues that the reason why the absorption is small is the whole experiment lasts too short, it only lasts less than a month.” 改进：“The professor points out that the limited absorption observed in the experiments can be attributed to their short duration, as they only lasted less than a month.”

示例2： 原文：“Thus the toxins in particular area will decline and this contamination and damage will be not permanent.” 改进：“As a result, toxin levels in the affected areas would decrease, and any negative impacts would be temporary rather than permanent.”

4.文章结构与组织 文章的结构和组织方面表现良好，包括引言、正文和结论。每段都集中讨论一个特定的观点，并提供支持细节。然而，在段落之间加入更明确的过渡词和短语可以使文章更连贯。此外，尝试使用不同的句式和结构，以增加文章的多样性。

示例1： 原文：“Firstly, the speaker refutes the point in the reading passage that iron fertilization is ineffective.” 改进：“To begin with, the professor challenges the claim made in the reading passage regarding the ineffectiveness of iron fertilization.”

示例2： 原文：“Secondly, the reading passage suggests that phytoplankton in the ocean will be toxic for many marine organism even for human beings…” 改进：“Furthermore, while the reading passage posits that phytoplankton could become toxic to marine organisms and even humans…”

5. 语法批改

Three theories are listed in the reading passage to explain the potential weakness of iron fertilization. However, the professor refutes each of them in a systematic method.

Firstly, the speaker refutes the point in the reading passage that iron fertilization is ineffective. The speaker argues that the reason why the absorption is small is the whole experiment lasts too short, it only lasts less than a month. He contends that the phytoplankton will live for up to 2 or 3 months, while they don't absorb carbon dioxide until the second month. They absorb most CO2 during the last month. The absorption of CO2 is increasing in the second and third month.

Secondly, the reading passage suggests that phytoplankton in the ocean will be toxic for many marine organismmany marine organisms(Possible agreement error: 'many/several/few' + singular countable noun) even for human beings, whereas in the view of the speaker, this problem can be addressed by stopingstopping(misspelling) fertilization in certain area. He concedes that if scientists stop the fertilization in the area where confront the danger of toxins produced by phytoplankton, the nutrition will lose and phytoplankton will be dying. ThusThus,(Commas after conjunctive/linking adverbs in front of a new sentence.) the toxins in particular area will decline and this contamination and damage will be not permanent.

Thirdly, the author puts forward that too much nutrition produced by iron fertilization will influentin fluent(misspelling) the eco-balance, the lecturer demurs the idea and demonstrating that it is a risk that people have to face. If people abandon the iron fertilization, it may take greater changes and be harmful to ecological balance. If there is not enough phytoplankton in the ocean which can reduce carbon dioxide, there may be more risks. It has been the best way to address environmental problem like climate change.

Section Title: 6.文章修订

Revised Essay:

The reading passage presents three potential drawbacks of iron fertilization. However, the professor systematically refutes each of these concerns.

Firstly, the speaker challenges the reading passage's claim that iron fertilization is ineffective. The professor argues that the minimal absorption observed in experiments is due to their short duration, typically less than a month. He contends that phytoplankton have a lifespan of 2 or 3 months and do not begin absorbing significant amounts of carbon dioxide until their second month. The majority of CO2 absorption occurs during their final month, indicating that absorption rates would likely increase in longer experiments.

Secondly, the reading passage suggests that phytoplankton could produce toxins harmful to marine organisms and humans. The speaker counters this argument by stating that such issues can be mitigated by ceasing fertilization in affected areas. He explains that without continued fertilization, phytoplankton would lose essential nutrients and die off, leading to a decline in toxin production and preventing permanent damage.

Lastly, the author asserts that excessive nutrients from iron fertilization could disrupt ecological balance in ocean ecosystems. The lecturer disputes this notion by emphasizing the necessity of taking calculated risks to combat climate change. He posits that if iron fertilization is abandoned, more significant changes and harm could result from unmitigated climate change. In his view, increasing phytoplankton populations through iron fertilization remains one of the most promising strategies for addressing environmental issues such as climate change. (241 words)

Three theories are listed in the Revised Essay with Inline Explanations:

The reading passage to explain the presents three potential weakness of iron fertilization. drawbacks of iron fertilization (clarified the subject). However, the professor systematically refutes each of them in a systematic method. these concerns (simplified and clarified).

Firstly, the speaker refutes the point in challenges the reading passage passage's claim that iron fertilization is ineffective. The speaker ineffective (clarified and simplified). The professor argues that the reason why the minimal absorption observed in experiments is small is the whole experiment lasts too short, it only lasts due to their short duration, typically less than a month. month (rephrased for clarity). He contends that the phytoplankton will live for up to have a lifespan of 2 or 3 months, while they don't absorb months and do not begin absorbing significant amounts of carbon dioxide until the their second month. They absorb most month (clarified timeline). The majority of CO2 absorption occurs during the last month. The their final month, indicating that absorption of CO2 is increasing in the second and third month. rates would likely increase in longer experiments (clarified reasoning).

Secondly, the reading passage suggests that phytoplankton in the ocean will be toxic for many could produce toxins harmful to marine organism even for human beings, whereas in the view of the speaker, organisms and humans (simplified phrasing). The speaker counters this problem argument by stating that such issues can be addressed mitigated by stoping fertilization in certain area. ceasing fertilization in affected areas (rephrased for clarity). He concedes explains that without continued fertilization, phytoplankton would lose essential nutrients and die off, leading to a decline in toxin production and preventing permanent damage (clarified reasoning).

Lastly, the author asserts that excessive nutrients from iron fertilization could disrupt ecological balance in ocean ecosystems (simplified phrasing). The lecturer disputes this notion by emphasizing the necessity of taking calculated risks to combat climate change (rephrased for clarity). He posits that if scientists stop the fertilization in the area where confront the danger of toxins produced by phytoplankton, the nutrition will lose and iron fertilization is abandoned, more significant changes and harm could result from unmitigated climate change (clarified reasoning). In his view, increasing phytoplankton will be dying. Thus the toxins in particular area will decline and this contamination and damage will be not permanent. ¶ Thirdly, the author puts forward that too much nutrition produced by iron fertilization will influent the eco-balance, the lecturer demurs the idea and demonstrating that it is a risk that people have to face. If people abandon the iron fertilization, it may take greater changes and be harmful to ecological balance. If there is not enough phytoplankton in the ocean which can reduce carbon dioxide, there may be more risks. It has been the best way to address populations through iron fertilization remains one of the most promising strategies for addressing environmental problem like issues such as climate change.change (summarized argument).

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Section Title: 8. Mind Map

# Mind Map

1. Introduction
   - Reading passage: drawbacks of iron fertilization
   - Professor's refutation

2. Ineffectiveness
   - Reading passage claim: minimal absorption observed in experiments
   - Professor's argument: short duration of experiments, phytoplankton lifespan, and increased absorption in longer experiments

3. Toxin Production
   - Reading passage claim: harmful toxins produced by phytoplankton
   - Professor's counterargument: mitigation by ceasing fertilization, decline in toxin production, and prevention of permanent damage

4. Ecological Disruption
   - Reading passage claim: excessive nutrients disrupting ecological balance
   - Lecturer's dispute: necessity of calculated risks, potential consequences of unmitigated climate change, and iron fertilization as a promising strategy for addressing environmental issues.

Section Title: 9. Keywords