TOEFL TPO -1 Speaking Task 3 Sample: Explain how the example of knapweed and fescue from theprofessor's lecture illustrates the concept of chemical competition.

1.子项得分 Delivery: 3 Language Use: 3 Topic Development: 3

2.预估分数

23. 3.表达

从表达方面来看，这位同学的回答基本上是清晰的，但在语音和语调上还有一些不足。建议同学多加练习，提高发音的准确性和自然度。此外，注意在适当的地方停顿，以便让听众更好地理解你的观点。

4.话题发展 从话题发展方面来看，这位同学的回答基本上是连贯和有条理的。但是，在解释实验过程时，可以更详细地描述实验中使用的两种土壤以及它们对植物生长的影响。此外，可以更明确地总结实验结果，说明这个例子如何证明了化学竞争的概念。建议同学在练习时尝试使用更多的连接词和例证来丰富和支持你的观点。

5.语言使用

Original Answer: According to the reading passage, the chemical competition is that certain plant species can be beat by producing and realizing chemicals that have an impact on nearby plants. According to the reading passage, chemical competition occurs when certain plant species produce and release chemicals that negatively affect nearby plants. (将句子结构进行了调整，使其更自然流畅，并纠正了拼写错误。) The researchers found that there are few plants can grow in the same area where nearby weeds grow. The researchers found that few plants can grow in the same area where knapweed grows. (修正了原文中的“weeds”为“knapweed”，使句子更准确。) Therefore, they tested the nearby effect. Therefore, they tested the effect of knapweed on other plants. (将原文中的“nearby effect”替换为“effect of knapweed on other plants”，使句子更清晰。) They divided into two groups. They conducted an experiment with two groups. (调整了句子结构，使其更自然。) The first group used normal soil, and the nipweed can grow well, but the fescue don't grow well. In the first group, normal soil was used, and the knapweed grew well, but the fescue did not. (修正了拼写错误，并调整了句子结构。) And they used special soil, and the nipweed and fescue can grow also well. In the second group, they used special soil, and both knapweed and fescue grew well. (修正了拼写错误，并调整了句子结构。)

Revised Answer (140 words): According to the reading passage, chemical competition occurs when certain plant species produce and release chemicals that negatively affect nearby plants. In the lecture, the professor discussed an experiment conducted by researchers to study the effect of knapweed on fescue grass. The experiment involved two groups. In the first group, normal soil was used, and the knapweed grew well, but the fescue did not. This result indicated that knapweed might be releasing chemicals that hindered the growth of fescue grass. In the second group, they used special soil that deactivated any chemicals released by plants. In this group, both knapweed and fescue grew well, confirming that knapweed engages in chemical competition. This example illustrates how knapweed uses chemical competition to dominate its environment and negatively impact other plants like fescue grass.

6.思维导图

- Chemical Competition
    - Reading Passage
        - Plant species produce and release chemicals
        - Negatively affect nearby plants
    - Lecture
        - Knapweed and Fescue Grass
            - Experiment
                - Group 1: Normal soil
                    - Knapweed grew well
                    - Fescue did not grow well
                - Group 2: Special soil (deactivates chemicals)
                    - Both knapweed and fescue grew well
            - Conclusion
                - Knapweed engages in chemical competition

7.关键词