TOEFL TPO -1 Speaking Task 3 Sample: Explain how the example from the professor's lecture illustrates theconcept of a vacancy chain.

Historical user samples and AI evaluation results from an older TOEFL format.

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Older TOEFL Format

This task is from a previous version of the TOEFL exam. The current TOEFL has a different structure. These archived samples remain available as a reference for practice.

Task Overview

Reading Passage

Vacancy Chains in many ecosystems, resources are limited. However, certain limited resources are alsoreusable, and some species have developed systems for sharing these reusable resourceswithin their community. One such system is known as a vacancy chain , When this occurs,an animal will leave a resource behind when it has finished using it, which creates a vacancy.or availability, for another animal to use that resource. When another animal then beginsusing the resource, this initiates a chain reaction in which resources are passed along fromanimal to animal. Using vacancy chains, animals within a species are able to accessresources that might otherwise be difficult to find.

Question

Explain how the example from the professor's lecture illustrates theconcept of a vacancy chain.

User Samples & Evaluation Results

Evaluation Result

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，这个回答的语言流利度和连贯性较好，但仍有一些不太自然的地方。建议在练习时注意提高发音的准确性，避免不必要的停顿。此外，可以尝试使用更丰富的词汇和表达方式，以增强说话的自然度和吸引力。

4.话题发展从话题发展方面来看，这个回答基本上解释了讲座中的例子如何说明空缺链的概念。然而，回答中对于讲座内容的复述和解释还有待加强。建议在练习时尝试更详细地描述讲座中提到的例子，并强调其与阅读材料中空缺链概念之间的联系。这样可以使回答更加完整和有说服力。

5.语言使用

原文：As mentioned in the reading passage, it is the situation that certain limited resources are also reusable and some species have developed systems for sharing these reusable resources within their communities. For example, some crabs use their shells for protection. When their bodies are bigger, they need to find a new shell. However, when they find a new shell quite big for them, they can wait around this shell until another animal comes to use this shell and put out their old shell. And then these crabs can use this old shell as their new shell and then put out their old shell for another one.

修改后：As mentioned in the reading passage, certain limited resources are reusable, and some species have developed systems for sharing these reusable resources within their communities. For instance, hermit crabs utilize their shells for protection. As they grow larger, they need to find a new, bigger shell. However, when they encounter a shell that is too large for them, they will wait near it until another hermit crab arrives to claim the shell and discard its previous one. Subsequently, the waiting crabs can use the discarded shell as their new home and leave their old shells for others.（原文中的"it is the situation that"表达较为生硬，可以直接用"are"替换。同时，将"some crabs"改为"hermit crabs"以与听力内容保持一致。此外，将"put out"改为"discard"使表达更准确。）

修改后的回答（140词）：

As mentioned in the reading passage, certain limited resources are reusable, and some species have developed systems for sharing these reusable resources within their communities. One such system is known as a vacancy chain. The lecture provides an example of hermit crabs using vacancy chains to find suitable shells. Hermit crabs utilize their shells for protection, and as they grow larger, they need to find a new, bigger shell. However, when they encounter a shell that is too large for them, they will wait near it until another hermit crab arrives to claim the shell and discard its previous one. Subsequently, the waiting crabs can use the discarded shell as their new home and leave their old shells for others. This process continues until each crab has a new shell that fits, illustrating the concept of a vacancy chain in their ecosystem.

6.思维导图

Reading Passage
- Limited resources
- Reusable resources
- Vacancy chains
Lecture
- Hermit crabs
  - Shells for protection
  - Growth and need for bigger shells
  - Waiting near larger shells
  - Chain reaction of exchanging shells
Conclusion
- Illustration of vacancy chain concept

7.关键词

Word	Phonetic Symbols	Parts of Speech	English definitions	Simplified Chinese translations	Sample sentences
ecosystem	/ˈiːkəʊsɪstəm/	noun	A community of living organisms and their environment, interacting as a system.	生态系统	The hermit crab's vacancy chain behavior is an essential part of their ecosystem.
reusable	/riːˈjuːzəbl/	adjective	Able to be used more than once.	可重复使用的	Reusable resources, such as shells, play a vital role in the hermit crab's survival strategy.
encounter	/ɪnˈkaʊntər/	verb	To unexpectedly experience or be faced with something.	遭遇	When hermit crabs encounter a shell that is too large, they wait nearby for another crab to claim it.
subsequently	/ˈsʌbsɪkwəntli/	adverb	Following after something else in time or order.	随后	Subsequently, the waiting crabs can use the discarded shell as their new home.
illustrate	/ˈɪləstreɪt/	verb	To make something clear by using examples, charts, pictures, etc.	说明，举例说明	The hermit crab's behavior effectively illustrates the concept of a vacancy chain in their ecosystem.