As if there weren’t enough of them in the world already, scientists have succeeded in cloning flies. The alike fruit flies are the first insects ever cloned, says the Canadian team that created them. 题目和参考答案——青夏教育精英家教网—

题目内容

As if there weren’t enough of them in the world already, scientists have succeeded in cloning flies. The alike fruit flies are the first insects ever cloned, says the Canadian team that created them. The question everyone asks is why anyone would want to clone flies in the first place. She hopes that the insects , which are very easy to experiment with , will help to adjust the cloning process in other animals and even in humans, where the technique is being researched to aid production of therapeutic （治疗的） stem cells.

In cloning, the DNA-containing nucleus of an adult cell is injected into an egg whose own nucleus（细胞核） has been removed. At the moment, the majority of cloned mice, sheep and other animals die before birth. It is thought this is because the adult DNA is not properly ‘reprogrammed’.

Using flies, researchers might discover genes that are important for this reprogramming, and that have matches in other animals. That is because it is relatively easy in flies to knock out the function of a single gene and then attempt cloning with these cells, which will test whether that gene is important. If such genes are confirmed, then in theory cloned mammalian embryos（晶胚） might be grown in selected solutions that change the activity of those genes to improve the technique’s success rate. Although some groups have attempted to clone insects before, Lloyd says this is the first time it has been successful. The team used a slight difference on the standard cloning process: they transferred nuclei taken from embryos rather than fully-grown adult cells. They sucked several nuclei （pl）out of developing fly embryos, and injected them into a fertilized（已受精的） fly egg. From over 800 early attempts, they cloned five adult insects, the group reports in the journal Genetics.

1．The best title of this passage probably is _______.

A．The importance of clone

B．First insects are cloned

C．The disagreement in clone

D．The advantages of clone

2．The scientists cloned flies because________.

A．there are fewer and fewer flies in the world

B．flies are easy to find and cheap to use

C．they can gain some experience before cloning other animals

D．it is safe to cline flies

3．The failure of most cloned animals is due to _______.

A．the difference of other animals’ genes

B．the improper technique of clone

C．the complex of other animals

D．the improper rearrange of the adult gene

4．It can be inferred from the last paragraph that ______.

A．the clone of insects before used grown-up cells

B．the clone of insects were never experimented before

C．this time scientists cloned flies successfully and easily

D．based on this success, other animals will be cloned in large quantities.

BCDA

练习册系列答案

寒假作业新世界出版社系列答案

宏翔文化快乐学习快乐寒假新疆美术摄影出版社系列答案

学期总复习复习总动员寒假长江出版社系列答案

快乐寒假南方出版社系列答案

相关题目

阅读理解

　　TOKYO－A child-like robot that combines the roles of nurse, companion and security guard is to go on the market to help the growing ranks of elderly Japanese with no one to look after them．

　　The“Wakamaru”robot can walk around a house 24 hours a day, warning family, hospitals and security firms if it perceives(notices)a problem．It will, for example, call relatives if the owner fails to get out of the bath．

　　Cameras implanted in the“eye-brows”of the robot enable it to“see”as it walks around an apartment．The images can be sent to the latest cellphones, which display the pictures．

　　Mitsubishi Heavy Industries, which developed Wakamaru, plans to start selling the metre-high robots by April, 2005, for about ＄15,000 Cdn．

　　Wakamaru, which speaks with either the voice of a boy or girl, is also designed to provide companionship, greeting its“papa”when he comes home．

　　It is the first household robot able to hold simple conversations, based on a vocabulary of around 10,000 words．It cannot only speak but can understand answers and react accordingly．

　　It will ask“Are you all right?”if its owner does not move for some time．If the answer is no, or there is no answer, it will telephone preset numbers, transmitting images and functioning as a speakerphone．

　　Wakamaru will in form a xecurity firm if ther is a loud bang or if an unknown person enters the house while the owner is out or asleep．It can recognize up to 10 faces．

　　But like nost robots it cannot climb stairs．

　　It can be set to remind forgetful people when it is time to take medicine, eat and sleep．

　　Mitstubishi adapted Wakamaru from robots it already makes to go around nuclear power facilities．The idea to use the technology in the home came from a company employee．

　　The project chief said,“Looking at the ageing of society and the falling birth rate we decide that this could work as a business．We want to offer Wakamaru as a product that helps society．”

　　The technology has gained nation-wide publicity in Japan among increasing xoncern over how to look after the ever-growing number of old people．The life expectancy of Japanese women has shot up to almost 85, the highest in the wolrld．

　　At the same time, extended families are being rdplaced by nuclear families．This has left many Japanese anxious about their elderly parents, whom they rarely see because of their long hours at the office．

(1)

Which of the following is true about the Robot?
[　　]
A．	It is used in some nuclear power facilities．
B．	It cannot speak but can understand answers．
C．	It can go up and soen the starirs easily．
D．	It can recognize as many as 10 faces．

(2)

The purpose of this passage is ________．
[　　]
A．	to introduce a new product
B．	to solve the ageing problems
C．	to tell people hwo to use the robot
D．	to show the rapid development of technolygy

(3)

What can we infer from the passage?
[　　]
A．	The robot can dial proper numbers for help．
B．	The robot is likely to have a promising market．
C．	The robot has given the Japanese a chance to live longer．
D．	The nuclear families have left many elderly Japanese anxious．

(4)

What is the best title of this passage?
[　　]
A．	The Latest Development of Robot Technology
B．	Japanese Robot and the Ageing Society
C．	Vast Market of the New Robot
D．	Japanese-built Robot to Help the Old

阅读理解

　　TOKYO－A child-like robot that combines the roles of nurse, companion and security guard is to go on the market to help the growing ranks of elderly Japanese with no one to look after them．

　　Cameras implanted in the“eye-brows”of the robot enable it to“see”as it walks around an apartment．The images can be sent to the latest cellphones, which display the pictures．

　　Mitsubishi Heavy Industries, which developed Wakamaru, plans to start selling the metre-high robots by April, 2005, for about ＄15,000 Cdn．

　　Wakamaru, which speaks with either the voice of a boy or girl, is also designed to provide companionship, greeting its“papa”when he comes home．

　　It is the first household robot able to hold simple conversations, based on a vocabulary of around 10,000 words．It cannot only speak but can understand answers and react accordingly．

　　Wakamaru will in form a xecurity firm if ther is a loud bang or if an unknown person enters the house while the owner is out or asleep．It can recognize up to 10 faces．

　　But like nost robots it cannot climb stairs．

　　It can be set to remind forgetful people when it is time to take medicine, eat and sleep．

　　Mitstubishi adapted Wakamaru from robots it already makes to go around nuclear power facilities．The idea to use the technology in the home came from a company employee．

　　The project chief said,“Looking at the ageing of society and the falling birth rate we decide that this could work as a business．We want to offer Wakamaru as a product that helps society．”

　　At the same time, extended families are being replaced by nuclear families．This has left many Japanese anxious about their elderly parents, whom they rarely see because of their long hours at the office．

(1)

Which of the following is true about the Robot?
[　　]
A．	It is used in some nuclear power facilities．
B．	It can recognize as many as 10 faces．
C．	It can go up and seen the stairs easily．
D．	It cannot speak but can understand answers．

(2)

The purpose of this passage is ________．
[　　]
A．	to introduce a new product
B．	to show the rapid development of technology
C．	to tell people how to use the robot
D．	to solve the ageing problems

(3)

What can we infer from the passage?
[　　]
A．	The robot can dial proper numbers for help．
B．	The nuclear families have left many elderly Japanese anxious．
C．	The robot has given the Japanese a chance to live longer．
D．	The robot is likely to have a promising market．

(4)

What is the best title of this passage?
[　　]
A．	The Latest Development of Robot Technology
B．	Japanese-built Robot to Help the Old
C．	Vast Market of the New Robot
D．	Japanese Robot and the Ageing Society

阅读理解

　　It was Satuday．As always, it was the one, for “Six days, shall you labar and all your work”was taken senously back then, Outside, Father and Mr．Patnce ncxt door were bxsy conny tcood lnside the wiel users Mother ane Mrs．Patrick were enpted in seeng cleaning

　　Somehow the boy s had shipped away to the back lot with their kites．Now, evet at the reis of having Brother caught to beat carpets．they had sent him to the kitchen tox exsre xding, sccmed there was no limt to the heights to which kites would fly today

　　My mothe looked at the sitting room, its furndign disordered for a tborough sweeting．Again she cast a look toward the window “Come on, girls! Let's take sing to the beer and theem a tutue”

　　On the way we met Mrs．Patrick, Ianghing guiltily as if she wrig doing woeig wrong

　　The never was such a day for flying kites! We played all our frsh string into the boys' kites up higher and higher, We could hardly distingwish the orang-coloced sports of the kites Now and then we slowly pullked one kite back, watching it dancing upo and down in the wind and finally bringing it down to earth, just for the joy of sending yt up again

　　Even out fathers dropped their tools and joined us．Out mothers look their turn, laughing like schoolgirls Ithink we were all beside ourselves Parents forgx their daty and their dignity; children for everyday fights and little jealousies．"Perhaps it's like this in the some of heafer,"I thought confusedly．

　　It we growing dark before we all walked sleepily back to the housew．Isuppose we had some chean and orderly enough．The strange thing was, we didn't mention that ady afterward Ifelt a little embarrasse．Surely none of the of the others had been as exceted as I Ikxked the memory up in that deepest part of me where we keep “the things that cannot be and yet they are”

　　The years went on, then one day Iwas hurrying about my kitchen in a city apartment, trying to get some work out of the way while my three-year-old, sisrently cried her desire to go park, see duck

　　“I can't go!”I said．”“I have this angt and when I'm through I'll be too rired to walk that far

　　My mother, who was visiting us, go up from the peas she was shelling It's a wllderful day, she offered, really warm, yet there's a fine breeu．Do you remimber that day we flew kites?

　　I stoppoed in my dash between store and sink．The locked door flew open and with it a rush of memorese Come on, I told my little girl You're right, it's too good d day to miss．

　　Another decade passed, We were in the aftennath(余波)of a great war, All evening we had been asking our returned soldier, the youngest Patrick Boy, about his experiences as a prisone war, He has ked freely, but now for a long time he had been silent, What was he thinking of-what dark and horrible things?

　　"Sany!"A smile shpped out frow his jips．"Do you remem-no, of course you wouldn't make the impression on you as it did on me．”

　　I hardly dared speak,”Remrmber what?

　　“I used to think of that day a lot in POW camo(战俘营)，when things weren's too good, DO you remember the we flew the kites?

(1)

mrs．patnck was laughing gultily because she thought ________
[　　]
A．	she was too old to fly kites
B．	her husband would make fun of her
C．	she shoule have been doing her how
D．	supposed to the don't game

(2)

by “we were all beside ourselves writer means that they all ________
[　　]
A．	felt confused
B．	went wild with joy
C．	looked on
D．	forfot their fights

(3)

what did the think atfer the kite flying?
[　　]
A．	boys must hace had nore fun than the firls
B．	shoule have finished their work before playing
C．	her parents should spend more time with them
D．	all the others must have forgotten that day

(4)

why did the writer finally agree to jtake her little girl for an outing?
[　　]
A．	she suddenluy renmenbered ther duty as mother
B．	she was reminded of the day thety felw kits
C．	she ha dfinished her
D．	she thought it was a

(5)

the youngest patrick boy iss mentioned to show that ________
[　　]
A．	the write was not alone in treasuring her fond menories h
B．	his expenience in POW camp threw a shadow over his life
C．	childhood friend\ship means so much to the writer
D．	people like him really changed a lot after the war

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　US musician and poct Gil Scott-Heron, often called the Godfather of Rap, has died in a New York hospital 62．　　1　　

　　Scott-Heron was born in Chicago in 1949－the son of a former Britain football player．　　2　　

　　Scott-Heron’s material covered soul, jazz, blues and the spoken word．His 1970s work heavily influenced the US hip-hop and rap scenes．

　　　　3　　 But the artist himself refused this title．“If ther was any individual initiative that I was responsible for, it might have been that there was music in certain poems of mine, with complete progression and repeating “hooks”．　　4　　” Soott-Heron wrote in the introduction to his 1990 Now and Then collection of poems．Scott-Heron’s music and poetry showed his ddep interest in justice and civil rights, and he complained against the consumer society of the 1970s and 80s as well as the development of muclear technology．He was among the first artists to use h is music to attack the apartheid(种族隔离)in South Africa, long before the issue became the focus of a popular global campaign．　　5　　 One of his most famous pieces was The Revolution Will Not Be Televised．In this piece, he criticized the role of race in the mass media and advertising age．

　　But in a 1998 interview with the Chicago Tribune, Scott-Heron wrned against focusing on the political aspect of his work．“If you only focus on the political aspects of our work, you change us．We’ve done 20 albums and not all of the songs on them are political．” He said．

A．But I don’t like football in Britain．

B．His work had a strong political element．

C．He grew up in Tennessee before moving to New York．

D．Scott was so crazy about politics that all of his songs are political．

E．This made them more like songs than just recitations with percussion．

F．The cause of his death is not clear, but he is believed to have become ill after returning from a visit to Europe．

G．The pioneering style he developed while working with Jackson, mixing minimalist percussion with poetry, meant that Scott-Heron was often described as the Godfather of rap．

Every day we experiencc one of the wonders of the world around us without even realizing it It is not the amszing complexity of television. Nor the impressive tcchnology of transport The universal wonder we share and

Experience is our ability to make noises with our mouths, and so transmit ideas and thoughts to each other’s minds. This ability comes so naturally that tend to forget what a miracle（奇迹）it is.

Obviously, the ability to talk is something that marks humans off from animals. Of course, some animals have powers just as amazing. Birds can fly thousands of miles by observing positions of the stars in the sky in relation to the time of day and year. In Nature’s went show, humans are a species of animal that have deve pod their own special act. If we reduce it to basie ferms, it’s a ability for communicating information to ther by varying sounds we make as we breathe out.

Not the to don’t have other powers of communication. Our facia. expressions convey our emotions, such as anger, or jout or disappointment. The way we hold our beads can indicate to others whether we are happy or sad. This is so-called “body language”. Bristling(直立的)fur is an unmistakable warning of attack among many animals. Similarly, the bowed bead or drooping tail shows a readiness to take second place in any animal gathering.

Such a means of communication is a basic mechanism that animals, including human beings, instinctively acquire and display. Is the ability to speak just another sort of instinct? If so, how did human beings acquire this amazing skill? Biologists can readily indicate that particular area of our brain where speech mechanisms function, but this doesn’t tell us how that part of our bodies originated in our biological history.

1.According to the passage, the wonder we take for granted is_________.

A.our ability to use language

B.the miracle of technology

C.the amazing power of nature

D.our ability to make noises with mouth

2.What feature of “body language”mentioned in the passage is common to both humans and animals?

A.Lifting beads when sad.

B.Keeping long faces when angry.

C.Bristling hair when ready to attack.

D.Bowing heads when willing to obey.

3.What can be inferred from Paragraph 3?

A.Body language is unique to humans.

B.Animals express emotions just as humans do.

C.Humans have other powers of communication.

D.Humans are no different from animals to some degree.

4.This pastge is mainly about________________.

A.the development of body language

B.the special role humans play in nature

C.the power to convey information to others

D.the difference between humans and animals in language use

试题分类