TOEFL TPO -1 Speaking Task 4 Sample: Using points and examples from the lecture, describe how scientists use the fossils to study past climates.

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，发言者的语言流利度和语速基本一致，偶尔有停顿。为了提高发言质量，建议发言者注意在适当的地方停顿，以增强语言的连贯性。同时，注意准确发音，避免拼写错误。

4.话题发展 从话题发展方面来看，发言者的回答内容基本上是连贯和有组织的，但在某些地方可以进一步加强。建议发言者在描述科学家如何利用化石研究古气候时，更详细地解释化石中的矿物比例和化学成分如何反映出过去的环境条件。此外，在举例子时，可以尝试提供更具体的信息，以便更好地支持观点。

5.语言使用

Original Answer: Using the fossils, the scientists would study past climates. Scientists use fossils to study past climates. (将句子改为主动语态，使表达更自然) For instance, they will find that whether the climates were cooler or warmer than nowadays. For example, they determine if past climates were cooler or warmer than today's climate. (修改句子结构，使表达更清晰) For example, they will study a kind of shellfish fossil to determine the conditions at that time. They examine shellfish fossils to determine the environmental conditions of that time. (简化句子结构，使用更准确的词汇) For instance, they will find the information about mineral proportions to determine some conditions such as greenhouse gas level. They analyze mineral proportions in fossils to infer factors like greenhouse gas levels. (使用更准确的动词和表达方式) Also, they will use the mechanism level and they will compare this level with the level in the modern animals in the same areas. Additionally, they compare magnesium levels in fossilized and modern shellfish from the same area. (更正关键词，简化句子结构) So they will determine that the past climates, for instance, if the level is lower than the climate was cooler, if higher than the level was warmer. Thus, they can conclude that lower magnesium levels indicate cooler past climates, while higher levels suggest warmer climates. (修改句子结构，使表达更清晰)

Revised Answer (140 words): Scientists use fossils to study past climates. For example, they determine if past climates were cooler or warmer than today's climate. They examine shellfish fossils to determine the environmental conditions of that time. They analyze mineral proportions in fossils to infer factors like greenhouse gas levels. Additionally, they compare magnesium levels in fossilized and modern shellfish from the same area. Thus, they can conclude that lower magnesium levels indicate cooler past climates, while higher levels suggest warmer climates. By understanding these relationships between fossil composition and environmental factors, scientists can gain valuable insights into how Earth's climate has changed over time. This knowledge helps them better predict future climate trends and develop strategies to mitigate potential impacts on ecosystems and human societies.

6.思维导图

- Fossils
    - Study past climates
        - Cooler or warmer than today
    - Shellfish fossils
        - Environmental conditions
            - Mineral proportions
                - Greenhouse gas levels
            - Magnesium levels
                - Comparison with modern shellfish
                    - Lower levels: cooler past climates
                    - Higher levels: warmer past climates

7.关键词