第27套
Birdsong
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Birdsong is the classic example of how genes(hereditary information)and environment both have a crucial role to play in the behavioral development of animals. Since the pioneering work of W.H.Thorpe on chaffinches(a common European bird), many species have been studied,and it has become clear both that learning plays an important role for all species and also that there are constraints on what they are able to learn.
1.The word“pioneering”in the passage is clot in meaning to
recent
famous
original
controversial
Paragraph2
Thorpe was able to show that learning from others was involved in chaffinch birds through a ries of experiments on hand-reared chicks(young birds).As in most other species,only the males sing.Thorpe found that,if he raid young males in total isolation from all others,the song they produced was quite different from that of a normal adult.It was about the right length and in the correct frequency range.It was also split up into a ries of notes as it should be.But the notes lacked the detailed structure found in wild birds,nor was the song split up into distinct phras as it usually is.This suggested that song development requires some social influence.Later experiments in which rearchers played recordings of songs to young birds showed just how preci this influence was:many of them would learn the exact pattern of the recording they had heard.A remarkable feature here was that birds were able to copy precily songs that they only heard in the first few weeks of life,yet they did not sing themlves until about eight months old.They are thus able to store a memory of the sound within their brain and then match their own output to their recollection of it when they mature.
2.The word“distinct”in the passage is clot in meaning to
short
simple
parate
similar
3.According to paragraph2,all of the following are characteristics of the songs of
the young chaffinches in Thorpe’s experiment EXCEPT:
They were not identical to the songs of normal adult chaffinches.
They lacked the complex form of the songs of wild chaffinches.
They were as long as the songs of normal adult chaffinches.
They were clearly different from each other.
4.According to paragraph2,rearchers discovered which of the following by
playing recordings of songs to chaffinches?
Chaffinches could no longer be taught to reproduce sounds after the first few weeks of life.
Chaffinches could not reproduce songs with exactly the same patterns of recorded songs.
Chaffinches at the age of eight months could recall and reproduce a song that they heard in the first few weeks of life.
良莠不齐Chaffinches that learned a song from recordings in the first few weeks of life were later unable to copy the sounds of mature chaffinches.
5.All of the following are mentioned in paragraph2as characteristics of wild
chaffinches EXCEPT:
They are able to copy songs very precily.
Their song development requires interaction with other chaffinches.
Their songs are not as well-structured as the songs of other birds.
It is the males of the species that do the singing.
茶叶水洗脸
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Young chaffinches normally learn only chaffinch song,though Thorpe found they could be trained to sing the song of a tree pipit(another type of bird),which is very similar to that of their own species.In general,however,the constraints on learning which birds have ensure that they only learn songs appropriate to the species to which they themlves belong.The constraints may be in their brain’s circuitry,the young bird hatching with a rough idea of the sounds that it should copy.The crude song of a bird reared in isolation gives some clues as to what this rough idea may be:the length, the frequency range and the breaking up into notes are all aspects of chaffinch song shared between normal birds and tho reared in isolation.In other cas the constraints are more social,young birds only being prepared to learn from individuals with whom they have social interactions.Thus,in a number of species,it has been found that they will not copy from recordings,but will do so from a live tutor.In some cas this may occur when they are young birds,but in others the main learning period is when they t up their territories and interact with neighbors for the first time,enabling them to match their neighbor’s songs and so countering with them. Whatever the nature of the learning rules in a particular species,there is no doubt that they are effective;it is very unusual to hear a wild bird singing a song which is not typical of its own species despite the many different songs which often occur in a small patch of woodland.
6.The word“enabling”in the passage is clot in meaning to
allowing
challenging
forcing
preparing
7.It can be inferred from paragraph3that one of the functions of songs in birds is to bring together birds living in groups with birds living in isolation
help young birds distinguish other young birds from adults
新增专业make possible interactions between birds of different species好结尾摘抄大全
help birds to establish territories
光标捕捉
8.Which of the ntences below best express the esntial information in the
highlighted ntence in the passage?Incorrect choices change the meaning in important ways or leave out esntial information.
Songs produced by chaffinches reared in isolation are cruder than the songs of wild birds.
The song of a bird reared in isolation suggests which aspects of chaffinch song may be inborn.
Comparing the crude songs of chaffinches reared in isolation to the songs of wild chaffinches suggests differences as well as similarities.
Studying the song aspects of chaffinches reared in isolation,rearchers have gained a better understanding of the songs produced by wild birds.
9.According to paragraph3,in some species,young birds do not copy songs from
recordings becau
they learn to sing only by live interactions with other birds
their ability to learn from recordings occurs later in life
they can only learn the songs of the birds living in their area of woodland
they can only learn songs from other birds of their own species
10.Why does the author mention that it is very unusual to hear a wild bird singing a
song which is not typical of its own species?
To explain why a variety of different bird songs are often heard in a relatively small area
To argue that social constraints have a greater impact upon learning than do genetic constraints
To provide an example of how the process of learning rules varies from one species to another
To illustrate how effective the different constraints upon learning are in young birds
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However,not all birds show the same learning pattern as do chaffinches.There are some species which produce normal sounds even if deaf,so that they cannot hear their own efforts,much less copy tho of others.The cooing of doves and the crowing of
cocks are examples here.In other cas,such as parrots and hill mynahs,birds can be trained to copy a huge variety of sounds,though tho they learn in the wild are usually more restricted.The amazing capability of mynahs has apparently arin simply becau birds in an area learn a small number of their calls from each other, males from males and females from females,and the calls are highly varied in structure.The ability to master them has led the birds,incidentally,to be capable of saying“hello”and mimicking a wide variety of other sounds.
11.The word“restricted”in the passage is clot in meaning to编诗
important
popular
limited
accurate
12.According to paragraph4,why are mynahs able to learn to make a wide variety of
sounds?
They have the ability to imitate any sound that they are expod to.
The frequency with which mynahs travel from one small area to another expos them to a wide variety of sounds.
They are expod in the wild to calls that are very different from each other.
An acute n of hearing allows them to listen to and copy many different sounds.
13.Look at the four squares[■]that indicate where the following ntence can be
added to the passage.
Are the constraints genetic,environmental,or both?
Where would the ntence best fit?Click on a square[■]to add the ntence to the passage.
无端的近义词Paragraph3
Young chaffinches normally learn only chaffinch song,though Thorpe found they could be trained to sing the song of a tree pipit(another type of bird),which is very similar to that of their own species.■In
general,however,the constraints on learning which birds have ensure that they only learn songs appropriate to the species to which they themlves belong.■The constraints may be in their brain’s circuitry,the young bird hatching with a rough idea of the sounds that it should copy.■The crude song of a bird reared in isolation gives some clues as to what this rough idea may be: the length,the frequency range and the breaking up into notes are all aspects of chaffinch song shared between normal birds and tho reared in isolation.■In other cas the constraints are more social,young birds only being prepared to learn from individuals with whom they have social interactions.Thus,in a number of species,it has been found that they will not copy from recordings,but will do so from a live
tutor.In some cas this may occur when they are young birds,but in others the main learning period is when they t up their territories and interact with neighbors for the first time,enabling them to match their neighbor’s songs and so countersing with them.Whatever the nature of the learning rules in a particular species,there is no doubt that they are effective;it is very unusual to hear a wild bird singing a song which is not typical of its own species despite the many different songs which often occur in a small patch of woodland.
14.Directions:An introductory ntence for a brief summary of the passage is
营养排骨汤
provided below.Complete the summary by lecting the THREE answer choices that express the most important ideas in the passage.Some answer choices do not belong in the summary becau they express ideas that are not prented in the passage or are minor ideas in the passage.
A.Although only male chaffinches are able to sing in the wild,Thorpe found that he could teach hand-reared females to copy songs from recordings and live tutors.
B.Chaffinches reared in isolation produce songs that differ significantly from tho of normal birds,suggesting that some social influence is important for learning a song precily.
C.Birds vary a great deal with respect to both the variety of sounds they are able to learn and the conditions that must be prent for them to be able to learn their species’song.
D.Chaffinches that are expod only to other bird species for the first few weeks of their life are likely to learn the songs of tho species instead of the chaffinch song.
E.Rearchers believe that both the circuitry or a bird’s brain and its interactions with other birds of the same species may prevent birds from learning the songs of other species.
F.The ability of deaf birds to produce their normal species’song suggests that genes play a much gre
ater role than environment in determining the behavior of most bird species.
The Role of Diapau
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If conditions within an organism’s environment occasionally or regularly become harsh,it may be advantageous for an organism to have a resistant stage built into the life cycle.In such a life history strategy,the organism suspends any growth, reproduction,or other activities for a period of time so that they may occur at a later, more hospitable time.This genetically determined resting stage,characterized by the cessation of development and protein synthesis and suppression of the metabolic rate, is called diapau.Many other kinds of resting stages,with different levels of suppression of physiological activities,are known.Some of the resistant stages can be extremely long-lived.In one ca,eds of the arctic lupine,a member of the pea family recovered from ancient lemming burrows in the Arctic,germinated in three
