The process of succession and the stability of a climax community can change over time.
Answer choices
○The changes that occur in an ecosystem from the pioneer to the climax community can be seen in one human generation.
○A high degree of species diversity does not always result in a stable ecosystem.
○The level of resilience in a plant community contributes to its long-term stability.
○Ecologists agree that climax communities are the most stable types of ecosystems.
○Disagreements over the meaning of the term “stability” make it difficult to identify the most stable ecosystems.
○The resilience of climax communities makes them resistant to destruction caused by humans.
托福阅读真题参考答案:
1. ○32. ○33. ○14. ○25. ○36. ○27. ○38. ○29. ○110. ○311. ○412. ○413. ○214. ○2 3 5
托福阅读真题译文:
生态系统的长期稳定
植物群体可以自由地聚集,他们特殊的结构取决于聚集区域的具体历史。生态学家使用“演替”来诠释植物群落和生态系统随着时间推移所发生的变化。演替中的第一个群落被称作先锋群落,而处于演替最后那个长期生存的群落被称为顶极群落。先锋群落和紧接着的植物群落的变化周期是从1到500年不等,植物数量和混合种类数量的变化是慢慢积累的。顶极群落本身也改变,但其变化周期超过500年。
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