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12.20托福口语机经+1220回忆免费版

2015-12-08 14:57 | 编辑: xiaoxu | 来自: 小站教育

摘要: 12月20日的托福考试距离现在还有一段时间,现在小站教育提前给出权威预测内容,希望大家的考试有所突破,小站机经全部免费,有版本的区别,需要大小范围跟在线老师免费索取就可以了。1

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  12.20托福口语机经+1220回忆免费版

  12月20日的托福考试距离现在还有一段时间,现在小站教育提前给出权威预测内容,希望大家的考试有所突破,小站机经全部免费,有版本的区别,需要大小范围跟在线老师免费索取就可以了。12.20托福口语机经+1220回忆免费版

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  12.20托福口语机经+1220回忆免费版

  Reading Passage 3

  Title:鸟类的集体效应

  Question types:

  文章内容回顾:主题 生物学类素材

  文中主要讲述了鸟类的集体效应,他们怎么通过集群来保护自己的子嗣和其他的一些集体行为。

  难度分析:生物学类素材在最近几次托福阅读中是比较常见的素材,考生后续考试中需要注意。其中,关于:哺乳动物、鸟类动物为热点话题。

  相关背景内容:A flock is a group of birds conducting flocking behavior in flight, or while foraging. The term is akin to the herd amongst mammals. The benefits of aggregating in flocks are varied and flocks will form explicitly for specific purposes. Flocking also has costs, particularly to socially subordinate birds, which are bullied by more dominant birds; birds may also sacrifice feeding efficiency in a flock in order to gain other benefits.[1] The principal benefits are safety in numbers and increased foraging efficiency. Defense against predators is particularly important in closed habitats such as forests where predation is often byambush and early warning provided by multiple eyes is important, this has led to the development of many mixed-species feeding flocks. These multi-species flocks are usually composed of small numbers of many species, increasing the benefits of numbers but also increasing potential competition for resources.

  Group size is a major aspect of the social environment of gregarious animals. However, one has to be careful when using group size measures to characterize animal sociality, because average individuals live in groups larger than mean group size.

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  12.20托福口语机经+1220回忆免费版,以上就是本次机经的全部内容。

  

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