托福阅读常见考题：动物行为类题目如何作答?

 　　在2014年4月19日的托福阅读考试中出现了关于鸟类的集群效应的文章，新东方富亦聪老师指出：动物行为主题是托福阅读常见考点，那么关于动物行为类题目都需要了解哪些背景知识?面对这样的托福考题该如何作答呢?

　　托福阅读真题再现：

　　鸟类的集群效应，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;鸟把巢建在一起

　　有很多好处，例如某种鸟这样做的很成功：

　　1. 巢群建在岛上乱石中，防止哺乳动物来吃

　　2. 天敌来袭时集体抗争

　　3. 废弃的巢和在用的巢建在一起，以假乱真。还有利于后代存活，后代们一起被孵化，超过了天敌的需求，因此得以保存，还可以互相照看孩子。例如有种美洲的燕子，頟自到不同地方找食物，找不到的回来跟着找到的去，实现了信息共享。也有弊端，巢群外沿易受攻击，所以大家都往里面建巢，所以中心很拥挤，食物消耗也大，容易滋生寄生虫和疾病。

　　新东方富亦聪老师解析：

　　动物行为主题是托福阅读常见考点，结构不难理解。需注意各例证和主题的支撑关系。由于条理清晰，最后一题尽量考虑从正面选出，排除为辅。

　　动物行为类题目相关背景：

　　Bird colony

　　A bird colony is a large congregation of individuals of one or more species of bird that nest or roost in proximity¹ at a particular location. Many kinds of birds are known to congregate² in groups of varying size; a congregation of nesting birds is called a breeding colony. Colonial nesting birds include seabirds such as auks and albatrosses; wetland species such as herons; and a few passerines such as weaverbirds, certain blackbirds, and some swallows. A group of birds congregating³ for rest is called a communal⁴ roost. Evidence of colonial nesting has been found in non-neornithine birds (Enantiornithes), in sediments⁵ from the Late Cretaceous (Maastrichtian) of Romania.

　　Ecological⁶ functions

　　The habit of nesting in groups is believed to provide better survival against predators⁸ in several ways. Many colonies are situated⁹ in locations that are naturally free of predators. In other cases, the presence of many birds means there are more individuals available for defense¹⁰. Also, synchronized¹¹ breeding leads to such an abundance of offspring as to satiate predators.

　　For seabirds, colonies on islands have an obvious advantage over mainland colonies when it comes to protection from terrestrial predators. Other situations can also be found where bird colonies avoid predation. A study of Yellow-rumped Caciques in Peru found that the birds, which build enclosed, pouch-like nests in colonies of up to one hundred active nests, situate themselves near wasp¹² nests, which provide some protection from tree-dwelling predators such as monkeys. When other birds came to rob the nests, the caciques would cooperatively defend the colony by mobbing the invader¹³. Mobbing, clearly a group effort, is well-known behavior, not limited to colonial species; the more birds participating in the mobbing, the more effective it is at driving off the predator⁷. Therefore, it has been theorized that the larger number of individuals available for vigilance and defense makes the colony a safer place for the individual birds nesting there. More pairs of eyes and ears are available to raise the alarm and rise to the occasion.

　　Another suggestion is that colonies act as information centers and birds that have not found good foraging¹⁴ sites are able to follow others, who have fared better, to find food. This makes sense for foragers because the food source is one that can be locally abundant. This hypothesis would explain why the Lesser¹⁵ Kestrel, which feeds on insects, breeds in colonies, while the related Common Kestrel, which feeds on larger prey¹⁶, is not.

　　Colonial behavior has its costs as well. It has been noted¹⁷ that parasitism¹⁸ by haematozoa is higher in colonial birds and it has been suggested that blood parasites¹⁹ might have shaped adaptations such as larger organs in the immune system and life-history traits. Other costs include brood parasitism and competition for food and territory. Colony size is a factor in the ecological function of colony nesting. In a larger colony, increased competition for food can make it harder for parents to feed their chicks.

　　The benefits and drawbacks for birds of nesting in groups seem to be highly situational. Although scientists have hypothesized about the advantages of group nesting in terms of enabling group defensive²⁰ behavior, escape from predation by being surrounded by neighbors (called the selfish herd²¹ hypothesis), as well as escaping predators through sheer numbers, in reality, each of these functions evidently depends on a number of factors. Clearly, there can be safety in numbers, but there is some doubt about whether it balances out against the tendency for conspicuous²² breeding colonies to attract predators, and some suggest that colonial breeding can actually make birds more vulnerable. At a Common Tern colony in Minnesota, a study of Spotted²³ Sandpipers observed to nest near the tern colony showed that the sandpipers that nested nearest the colony seemed to gain some protection from mammalian predators, but avian predators were apparently²⁴ attracted to the colony and the sandpipers nesting there were actually more vulnerable. In a study of a Least Tern colony in Connecticut, nocturnal avian predators in the form of Black-crowned Night Herons and Great Horned Owls²⁵ were observed to repeatedly invade a colony, flying into the middle of the colony and meeting no resistance.

　　For seabirds, the location of colonies on islands, which are inaccessible²⁶ to terrestrial predators, is an obvious advantage. Islands where terrestrial predators have arrived in the form of rats, cats, foxes, etc., have devastated²⁷ island seabird colonies. One well-studied case of this phenomenon has been the effect on Common Murre colonies on islands in Alaska, where foxes were introduced for fur farming

1 proximity   

n.接近，邻近

参考例句：

• Marriages in proximity of blood are forbidden by the law.法律规定禁止近亲结婚。
• Their house is in close proximity to ours.他们的房子很接近我们的。

2 congregate   

v.(使)集合，聚集

参考例句：

• Now they can offer a digital place for their readers to congregate and talk.现在他们可以为读者提供一个数字化空间，让读者可以聚集和交谈。
• This is a place where swans congregate.这是个天鹅聚集地。

3 congregating   

（使）集合，聚集( congregate的现在分词 )

参考例句：

• The spatial distribution patterns of larvae and pupae are congregating distribution. 幼虫和蛹的空间分布均为聚集分布。
• He says victims of violence are congregating there because they feel safer. 他说暴力的受害者聚集在这里因为他们觉得更安全。

4 communal   

adj.公有的，公共的，公社的，公社制的

参考例句：

• There was a communal toilet on the landing for the four flats.在楼梯平台上有一处公共卫生间供4套公寓使用。
• The toilets and other communal facilities were in a shocking state.厕所及其他公共设施的状况极其糟糕。

5 sediments   

沉淀物( sediment的名词复数 )； 沉积物

参考例句：

• When deposited, 70-80% of the volume of muddy sediments may be water. 泥质沉积物沉积后，体积的70-80％是水。
• Oligocene erosion had truncated the sediments draped over the dome. 覆盖于穹丘上的沉积岩为渐新世侵蚀所截削。

6 ecological   

adj.生态的，生态学的

参考例句：

• The region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
• Each animal has its ecological niche.每种动物都有自己的生态位.

7 predator   

n.捕食其它动物的动物；捕食者

参考例句：

• The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
• Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴，它是一种令人恐惧的捕食性动物。

8 predators   

n.食肉动物( predator的名词复数 )；奴役他人者（尤指在财务或性关系方面）

参考例句：

• birds and their earthbound predators 鸟和地面上捕食它们的动物
• The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》

9 situated   

adj.坐落在...的，处于某种境地的

参考例句：

• The village is situated at the margin of a forest.村子位于森林的边缘。
• She is awkwardly situated.她的处境困难。

10 defense   

n.防御，保卫；[pl.]防务工事；辩护，答辩

参考例句：

• The accused has the right to defense.被告人有权获得辩护。
• The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。

11 synchronized   

同步的

参考例句：

• Do not use the synchronized keyword in Managed Objects. 不要在管理对象上使用synchronized关键字。 来自互联网
• The timing of the gun was precisely synchronized with the turning of the plane's propeller. 风门的调速与飞机螺旋桨的转动精确同步。 来自辞典例句

12 wasp   

n.黄蜂，蚂蜂

参考例句：

• A wasp stung me on the arm.黄蜂蜇了我的手臂。
• Through the glass we can see the wasp.透过玻璃我们可以看到黄蜂。

13 invader   

n.侵略者，侵犯者，入侵者

参考例句：

• They suffered a lot under the invader's heel.在侵略者的铁蹄下，他们受尽了奴役。
• A country must have the will to repel any invader.一个国家得有决心击退任何入侵者。

14 foraging   

v.搜寻（食物），尤指动物觅（食）( forage的现在分词 )；（尤指用手）搜寻（东西）

参考例句：

• They eke out a precarious existence foraging in rubbish dumps. 他们靠在垃圾场捡垃圾维持着朝不保夕的生活。 来自《简明英汉词典》
• The campers went foraging for wood to make a fire. 露营者去搜寻柴木点火。 来自辞典例句

15 lesser   

adj.次要的，较小的；adv.较小地，较少地

参考例句：

• Kept some of the lesser players out.不让那些次要的球员参加联赛。
• She has also been affected,but to a lesser degree.她也受到波及，但程度较轻。

16 prey   

n.被掠食者，牺牲者，掠食；v.捕食，掠夺，折磨

参考例句：

• Stronger animals prey on weaker ones.弱肉强食。
• The lion was hunting for its prey.狮子在寻找猎物。

17 noted   

adj.著名的，知名的

参考例句：

• The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
• Jim is noted for arriving late for work.吉姆上班迟到出了名。

18 parasitism   

n.寄生状态，寄生病；寄生性

参考例句：

• Gastrointestinal parasitism is characterized gastroenteritis, unthriftiness and anemia. 胃肠道寄生虫病的特征是：胃肠炎，瘦弱和贫血。 来自辞典例句
• Many biologists think that sex, for example, is a response to parasitism. 比如说许多生物学家认为性就是对寄生病菌的一种反应。 来自互联网

19 parasites   

寄生物( parasite的名词复数 )； 靠他人为生的人； 诸虫

参考例句：

• These symptoms may be referable to virus infection rather than parasites. 这些症状也许是由病毒感染引起的，而与寄生虫无关。
• Kangaroos harbor a vast range of parasites. 袋鼠身上有各种各样的寄生虫。

20 defensive   

adj.防御的；防卫的；防守的

参考例句：

• Their questions about the money put her on the defensive.他们问到钱的问题，使她警觉起来。
• The Government hastily organized defensive measures against the raids.政府急忙布置了防卫措施抵御空袭。

21 herd   

n.兽群，牧群；vt.使集中，把…赶在一起

参考例句：

• She drove the herd of cattle through the wilderness.她赶着牛群穿过荒野。
• He had no opinions of his own but simply follow the herd.他从无主见，只是人云亦云。

22 conspicuous   

adj.明眼的，惹人注目的；炫耀的，摆阔气的

参考例句：

• It is conspicuous that smoking is harmful to health.很明显，抽烟对健康有害。
• Its colouring makes it highly conspicuous.它的色彩使它非常惹人注目。

23 spotted   

adj.有斑点的，斑纹的，弄污了的

参考例句：

• The milkman selected the spotted cows,from among a herd of two hundred.牛奶商从一群200头牛中选出有斑点的牛。
• Sam's shop stocks short spotted socks.山姆的商店屯积了有斑点的短袜。

24 apparently   

adv.显然地；表面上，似乎

参考例句：

• An apparently blind alley leads suddenly into an open space.山穷水尽，豁然开朗。
• He was apparently much surprised at the news.他对那个消息显然感到十分惊异。

25 owls   

n.猫头鹰( owl的名词复数 )

参考例句：

• 'Clumsy fellows,'said I; 'they must still be drunk as owls.' “这些笨蛋，”我说，“他们大概还醉得像死猪一样。” 来自英汉文学 - 金银岛
• The great majority of barn owls are reared in captivity. 大多数仓鸮都是笼养的。 来自辞典例句

26 inaccessible   

adj.达不到的，难接近的

参考例句：

• This novel seems to me among the most inaccessible.这本书对我来说是最难懂的小说之一。
• The top of Mount Everest is the most inaccessible place in the world.珠穆朗玛峰是世界上最难到达的地方。

27 devastated   

v.彻底破坏( devastate的过去式和过去分词)；摧毁；毁灭；在感情上（精神上、财务上等）压垮adj.毁坏的；极为震惊的

参考例句：

• The bomb devastated much of the old part of the city. 这颗炸弹炸毁了旧城的一大片地方。
• His family is absolutely devastated. 他的一家感到极为震惊。