托福TPO33口语Task4阅读文本+听力文本+题目+满分范文
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托福TPO33口语Task4阅读文本+听力文本+题目+满分范文

为了帮助大家高效备考托福,蘑菇教育小编为大家带来托福TPO33口语Task4阅读文本+听力文本+题目+满分范文,希望对大家备考有所帮助。

  为了帮助大家高效备考托福,蘑菇教育小编为大家带来托福TPO33口语Task4阅读文本+听力文本+题目+满分范文,希望对大家备考有所帮助。

  托福TPO33口语Task4阅读文本:

  Carrying Capacity

  An animal species needs to have enough resources, like food and water, to survive in any given environment. However, because resources are limited, only a certain number of animals of a particular species are able to survive in a given habitat. The greatest number a habitat can support is known as the carrying capacity. If nothing happens to disrupt or unbalance the relationship between the animal and its habitat, the carrying capacity will remain stable. However, a carrying capacity is not fixed. If there is a significant disruption, such as an environmental event that alters the amount of available resources in the habitat, the carrying capacity will change.

  托福TPO33口语Task4听力文本:

  Now listen to part of a lecture in a biology class.

  ProfessorOK, so let's talk about what happened to a certain type of insect, a moth, a red-and-black moth that lives in Europe. These moths eat a plant called Ragwort and they live in fields where the Ragwort plants grow. Now, there was a group of moth that lives in one of these fields and, for many years, there was a lot of Ragwort growing there. So the moth had plenty to eat and the total number of moth in the field stayed pretty much the same. But then one year it rained a lot less than usual and the Ragwort didn't grow as well. The result was that the moth didn't get enough to eat and many didn't survive but even the ones that did survive didn't lay as many eggs as before. So that year the moth population in the field was quite a bit smaller. The next year, though, the amount of rainfall returned to normal and again many more Ragwort plants grew and, once again, there was a lot available for the moth to eat. So that yearthe moth population increased and the female moth laid many more eggs than the year before. And now, after all that rainfall and plant growth, there were just as many moth in the Ragwort field as there were before." "

  托福TPO33口语Task4题目:

  Explain the concept of carrying capacity using the example of the moth and Ragwort.

  托福TPO33口语Task4满分范文:

  The maximum number of species that a given habitat can support is called carrying capacity. According to the professor, there's a kind of red and black moths that eat a plant called ragworts, and they live in the ragworts field. When there was sufficient ragworts for the moths, the moths' population remained stable over the years, and that stable number of moths' was the field's carrying capacity. However, one year, the balance was disrupted as it rained much less than usual and the production of ragworts decreased, so the moth's population declined because of lack of food and female moths' inability to lay eggs. Then the next year, when the rainfall returned to its previous level, ragworts grew back, and accordingly the number of moths increased and female moths laid more eggs, and soon there were as many moths as the year before the drought, which suggests that carrying capacity of a given habitat changes with the disruption. (179 words)

  以上是蘑菇教育小编给大家整理的托福TPO33口语Task4阅读文本+听力文本+题目+满分范文,希望对你有所帮助!

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