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.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 |
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 clone flies |
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 |
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. |
第三部分:阅读理解(共10小题;每小题2分,满分20分)
请认真阅读下列短文,从短文后所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。
A
In meditation(冥想),people sit quietly and focus their attention on their breath. As they breathe in and out, they attend to their feelings. As thoughts go through their minds, they let them go. Breathe. Let go. Breathe. Let go.
According to a recent study at the Insight Meditation Society in Barre, Massachusetts, three months of training in this kind of meditation causes a marked change in how the brain allocates attention. It appears that the ability to let go thoughts that come into mind frees the brain to attend to more rapidly changing things and events in the outside world. Expert mediators are better than other people at catching such fast-changing stimuli, like facial expressions.
The study provides evidence for changes in the workings of the brain with mental training. People can learn and improve abilities of all sorts with practice, everything from driving to playing the piano. The study has shown that meditation is good for the brain. It appears to reduce pressure and promote a sense of well-being.
In an experiment, 17 volunteers with no meditation experience in the experimental group spent three months meditating 10 to 12 hours a day. A control group also with no meditation experience meditated for 20 minutes a day over the same period. Both groups were then given the tests with two numbers in a group of letters. As both group looked for the numbers, their brain activity was recorded.
Everyone could catch the first number. But the brain recordings showed that the less experienced mediators tended to grasp the first number and hang onto it, so they missed the second number. Those with more experience gave less attention to the first number as if letting it go, which led to an increased ability to grasp the second number. This shows that attention can change with practice.
Just ask Daniel Levision, who meditated for three months as part of the study.” I am a much better listener,” he said. “I do not get lost in my own personal reaction to what people are saying.”
56. The underlined word “them” in Paragraph 1 refers to ________.
A. feelings B. minds C. people D. thoughts
57. Meditations manage their daily tasks better because they ________.
A. are given less pressure B. allocate their attention better
C. have more stimuli for life D. practice them more frequently
58. The study proves that ________.
A. meditation improves one’s health B. brain activity can be recorded
C. human attention can be trainedD. mediators have a good sense of hearing
E
Support for renewable energy technology to figllt global warming is weakening in the face of
worldwide economic problems and the true scale of the carbon reductions required,a survey pub-
lished today has suggested.
Figures presented at the UN climate talks in Poznan,Poland,show that climate experts have
less faitll in alternative energy than they did 12 months ago.
The survey shows less support for wind energy,solar power,biofuels,biomass and hydrogen
energy as technologies with“high potential”to reduce carbon levels in the atmosphere over the next
25 years.
Eric Whan of Globesean,which carried out t}le survey of“climate decision makers”.said.
“As the climate crisis deepens they could be becoming less optimistic that individual technologies
may be able to solve the problem.’’
The survey,supported by groups including the World Bank,the United Nations Environment
Programme and the Pew Center for Global Climate Change,questioned l,000 senior figures across
governments,pressure groups and companies in 1 15 countries over the last few weeks.
Almost three—quarters of the experts agreed in the survey that“equitable(公平的,平等的)e—
eonomic growth and development and significant progress in combating(与…斗争)climate change
Call be achieved at the salne time.’’
Asked to rate the likely Success of low—carbon technologies in the mid—term,they showed
less confidence than a similar survey 12 months ago.Support for offshore wind farms,was down
61%from 65%last year.Solar electricity generation was rated as having high—potential by 66%of respondents,down from 74%.Support for hydrogen power was 32%,down form 36%in 2007.
The respondents also warned that a deep recession(衰退)would make a new global deal on climate harder to achieve.Some 44%agreed that the current economic crisis will significantly delay orcompromise the“achievement of effective climate change agreements.’’
72.Which of the following is NOT the alternative energy? ·
A.Wind energy. B.Solar power. C.Hydrogen energy.D.Conventional energy.
73.Which of the following altemative energy sees the most remarkable reduction in support'?
A.Offshore wind farms. B.Solar electricity.
C.Hydrogen power. D.Natural gas.
Why is support for renewable energy technology to fight dobal warming weakening?
A.The technology has no use at all.
B.People don’t want to use the technology.
C.Nothing can be done to reduce carbon levels in the atmosphere.
D.The current economic crisis iS to blame.
75.What’S the best title of the passage?
A.Experts Lost Faith in Renewable Technology B.Global Environment Is Worsening
C.Who Is to Blame f.0r tIle Environment D.What Can Be Done to Save the Earth
D
As school fl,tats again,there’s SO much mole for an American parent to nag(唠叨)about,like
homework,bedtime and lost hours on the Intemet.But in the age of digital childhood,Jacky Long-well,45,of McLean,Virginia,often text—messages(发短信)what she OnCe told her children bymouth_"Be nice to your brother;walk the dog;remember your reading.
This is the world of the modem family,in which even reminding children to do something has
become electronic.
There are changes in how parents nag and in what they nag about and in the frequency of their
nagging.
With technology,“you nag more,and you are a little bit more:precise with your nagging.’’said
Reginald Black,46,of Woodbridge,Virginia.
For many young people,electronic nagging is part of the experience of growing up.Charles Flowers,17,131.$enior at St.John“College High School in Washington.says his mothel-reminds him about everything from laundry,being Oil time to baseball practice and mowing the lawn by text.
When she uses capitals he knows she is serious:GET HOME!
Some say technology has made nagging less annoying.
Jaeky Longwell thinks texts ale less emotional than spoken messages and less likely to be resisted by teenagers.
It’s not as painful for them to hear it by text.It becomes grouped with the friendly communication,”she said.“They can’t hear the nagging.”
She thinks a good way to do it is to mix friendliness with nagging.A parent Call always start by
saying hello.
Not all parents like the new electronic r,agging.Joyce Bouehard,51,a mother of four in Fairfax,Virginia,texts her 14一year—old son but says that for many things — chores,homework— the
old—fashioned way works better.Nagging by text has risks,she notes:I always think,if you are texting them something and they are with their friends,they ale getting a big laugh out of it.’’
68.We can conclude from the first two paragraphs that————————.
A.American children often stay up late studying
B.Jacky Long'well had a happy aigital childhood
C.American parents pay too much attention to their children’s studies
D.American parents think a lot about their children’s characters
69.The example of Reginald Black is used to show readers————————.
A.that her nagging is thoughtful
B.how the amount and kind of nagging have changed with the arrival of the digital age
C.the kind of skills a parent needs to nag effectively
D.that she likes nagging her children very much
70.We can infer that—————————.
A.It’S better for parents to nag in a friendly,way
B.whether、nagging is e]ectronic or not,it is annoying
C.American parents generally don’t like to nag
D.American parents like to llse capital letters in messages
7 1.The main idea of the article is———————一.
A.the subjects American parents like to nag about
B.the reaSOliS American parents like to nag their children
C.that electronic nagging is becoming commoll in the U.S
D.how American parents began to nag their children by text messages
C
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64.What is this ad mainly about?
A.It mainly show8 US some way8 to spend weekends.
B.It mainly 8bows us a place to relax Olll',sehTe8.
C.It shows the way8 saving OUr time.
D.It shows US a lot of ways to spend OUr holidays.
65.Which of the following is TRUE according to this passage?
A.Men and women swim in the SPORTS CENTER separately.
B.People can play termi8 day and night.
C.Children at any age can pky golf in the SPORTS CENTER.
D.People under 20 can all take gymllfltstic8.
66.How many sports items title mentioned in the passage?
A.5. B.7 C.9 D.12.
67.Where carl we find this ad in your opinion?
A·In a company. B.In a restaurant. C.In a park D.On a newspaper.
B
How does it happen that children learn their mother tongue SO well?When we compare them
With adults learning a foreign language,we often find this interesting fact.A little child without
knowledge or experience often succeeds in a complete mastery of the language.A grown—up person with fully developed mental powers,in most cases,may end up with a faulty and inexact corflllland.What accounts for tllis difference?
Despite other explanations。tlle real answer in my opinion hes partly in the child himself,partly in the behaviour of the people around him.In the first place,the time of learning the mother tongue in the most favorable of all,namely,the first years of hfe.A child hears it spoken from morning till night and,what is more important,always in its genuine form,with the right pronunciation,rightIntonation,right use of words and right structure.He drinksin all the words and expressions which come to him in a hsh.ever—bubbhng spring.There is no resistance:there is perfect assimilation.
Then the child has,as it were,private lessons all the year round,while an adult language—
student has each week a limited number of hours which he generally shares with others.The child
has another advantage:he hears the language in all possible situations,always accompanied by the
right kind of gestures and facial expressions.Here there is nothing unnatural,such as is often found
In language lessons in schools,when one talks about ice and snow in June or scorching heat in January And what a child hears is generally what immediately interests him.Again and again,when his attempts at speech a聪successful,his desires are understood and fulfilled.
Finally,though a child’S“teachers”may not have been trained in language teaching,their re-
lations with him are always close and personal.ney take great pains to Inske their lessons easy.
60.’rhe main idea of the passage is——.
A.to tell why the native language is learnt SO well by children
B.to teach children to learn their lllothei"language we
C.to show that children’S teacher should take great p8ins to make their lessons easy
D.to do research into the difference between children and adults
61.What does the underlined phrase“dlq.nks in”in paragraph 2 mean?
A.drinks alcohol B.has a drink of C.takes in D.tastes
62.An adult has more difflculties in learning foreign languages well for the reason that_____.
A.children are more indiligent than adults
B.adults pay less attention to learning/anguages than children.
C.children have private lessons all the year around
D.an adult language—student has limited time to share with others
63.Ⅵmo ale the teachers teaching a child to learn his mother language?
A。His parents. B.His teachers. C.People around him.D.Himself.