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When it comes to social behaviourmammals are in a league of their own.Some birds may form pairsor even cooperate to huntbut the complexity (复杂性) of their relationships can hardly compare to those within a school of dolphinsa herd of elephants or a group of humans.What makes mammalian social groups different from a flock of starlings or a shoal of fishis that in many cases the individuals could recognize each other.Although we may think that? all elephants look pretty much the samewe can easily tell individuals of our own species apart and it has become clear through studies that the same is true of other species.Dolphins have their own signature whistles that act like “names”and elephants can recognize and greet other individuals they have known but not seen for many years.This is something that only a few species of birds appear to be able to do.

Mammals in complex social groups not only recognize each other as individualsbut also they remember a lot of information about that individual.Social groups often rely on this memory—such as knowing who is dominant to whomwho is related to whomand who has done what to whom in the past.It’s like remembering who you have lent money to or done a favour forand who hasn’t repaid that money or has talked about you behind your back.You have to learn who to trustwho your friends areand who to watch out for.

All this remembering goes on in a particular part of the brain called the neocortex (大脑皮层)If you compare the size of a mammal’s social group with the size of this part of the brainyou will find they are remarkably closely related.This area seems to take a long time to develop fully and animals in which it is very large take a very? long time to grow up to adulthood.During this timethe youngster has to learn all the rules of social behaviour in their group and to piece together all? the relationships between the group membersKnowledge that will be needed to avoid getting into trouble.

1.What is special about a mammalian social group according to the passage?

AAll the individuals cooperate to hunt.

BThe individuals can communicate with each other.

CThe individuals can recognize each other.

DThe individuals form closer relationship.

2.The passage suggests that elephants________.

Aare cleverer than dolphins

Bcan recognize other species

Cmay mistake a member for another

Dhave good memories

3. Animals whose area of the neocortex is large________.

Awill have a long period of time before they become adults

Bwill spend a shorter time learning the necessary knowledge

Cwill learn the necessary knowledge much more easily

Dwill have more difficulty in growing up as adults

4. If the neocortex is largerthe animals________.

Acan live a longer life

Bhave a smaller social group

Chave a larger social group

Dhave a greater body size

 

【答案】

1.C

2.D

3.A

4.C

【解析】

1.

解析 细节理解题。由文章第一段第三句可知,哺乳动物的一大特点是,一个群体中的每个个体都能辨认出其他的个体。

2.2】 D

解析 推理判断题。文章第一段倒数第二句说明,大象如果彼此认识,即使它们多年不见,但重新见面后也能认出对方互相打招呼,这说明它们记忆力很好。

3.3】 A

解析 细节理解题。由文章最后一段第三句可知,如果一个动物的大脑皮层很大,那么它成年所需的时间也就更长。

4.4】 C

解析 推理判断题。由文章最后一段可知,动物大脑皮层部位的大小与它群体的大小存在正相关的关系。故大脑皮层大,对应的社会群体也大。

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