As if there weren’t enough of them in the wor...

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 clone 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.

高二英语阅读理解中等难度题查看答案及解析

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 clone 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.　

高二英语阅读理解极难题查看答案及解析

No country in the world has more daily newspapers than the USA. There are almost 2,000 of them, as compared with 180 in Japan, 164 in Argentina and 111 in Britain. The quality of some American papers is extremely high and their views are quoted all over the world. Famous dailies like the Washington Post or the New York Times have a powerful influence all over the country. However, they are not national newspapers in the sense that The Times is in Britain or Le Monde is in France, since each American city has its own daily newspaper. The best of these present detailed description of national and international news, but many tend to limit themselves to state or city news.

Like the press in most other countries, American newspapers range from the “sensational” which feature crime and gossip(闲谈), to the “serious”, which focus on factual news and the analysis of world events. But with few exceptions, American newspapers try to entertain as well as give information, for they have to compete with the attraction of television.

Just as American newspapers satisfy all tastes, so do they also try to attract readers of all political parties. A few newspapers support extremist(极端主义的) groups on the far right and on the far left, but most daily newspapers try to attract middle-of-the-road Americans who are moderate(中立的). Many of these papers print columns by well-known journalists of different political and social views, in order to present a balanced picture.

As in other countries, American newspapers can be either responsible or irresponsible, but it is generally accepted that the American press serves its country well and that it has more than once courageously exposed political scandals(丑闻) or crimes, for instance, the Watergate Affair(水门事件). The Newspapers drew the attention of the public to the horrors of the Vietnam War.

1.There are fewer national newspapers in          .

　A. Britain than in the USA.    B. France than in Britain

　C. the USA than in Britain or France

　D. France than in the USA or Britain

2.Most American newspapers try hard to entertain their readers because

.　　

3.Many American newspapers attract readers of different political preference by          .

4.The passage is mainly about             .

高二英语阅读理解简单题查看答案及解析

No country in the world has more daily newspapers than the US. There are almost 2,000 of them, as compared with 180 in Japan, 164 in Argentina and 111 in Britain. The quality of some American papers is extremely high and their views are quoted all over the world. Famous dailies like the Washington Post or the New York Times have a powerful influence all over the country. However, they are not national newspapers in the sense that The Times is in Britain or Le Monde is in France, since each American city has its own daily newspaper. The best of these presents detailed description of national and international news, but many tend to limit themselves to state or city news.

Like the press in most other countries, American newspapers range from the “sensational” which feature crime and gossip (闲谈), to the “serious”, which focus on factual news and the analysis of world events. But with few exceptions, American newspapers try to entertain as well as give information, for they have to compete with the attraction of television.

Just as American newspapers satisfy all tastes, so do they also try to attract readers of all political parties. A few newspapers support extremist (极端主义的) groups on the far right and on the far left, but most daily newspapers try to attract middle-of-the-road Americans who are moderate (中立的). Many of these papers print columns by well-known journalists of different political and social views, in order to present a balanced picture.

As in other countries, American newspapers can be either responsible or irresponsible, but it is generally accepted that the American press serves its country well and that it has more than once courageously exposed political scandals (丑闻) or crimes, for instance, the Watergate Affair (水门事件). The newspapers drew the attention of the public to the horrors of the Vietnam War.

1.There are fewer national newspapers in 　　　　 .

A. the US than in Britain or France

B. France than in the US or Britain

C. Britain than in the US

D. France than in Britain

2.Why do most American newspapers try hard to entertain their readers?

A. Because they have to give factual news in an interesting way.

B. Because they have to keep up a good relation with them.

C. Because they have to write about crime and gossip.

D. Because they have to compete with television.

3.How do many American newspapers attract readers of different political preference?

A. By avoiding carrying articles about extremists.

B. By supporting extremist groups from time to time.

C. By printing articles representing different political viewpoints.

D. By inviting middle-of-the-road Americans to write articles for them.

4.The passage is mainly about 　　　　 .

A. the advantages and disadvantages of American newspapers

B. the characteristics of American newspapers

C. the development of American newspapers

D. the functions of American newspapers

高二英语阅读理解中等难度题查看答案及解析

There are many wetlands(湿地) in China and some of them have become the world’s important wetlands. The Chinese Yellow Sea Wetlands are among them. They are in Yancheng，Jiangsu Province. They are home of many different kinds of birds and animals. The world’s largest Milu Deer Nature Reserve(自然保护区) is in them. More than 700 milu deer live freely there.

The temperature in the wetlands is usually neither too high nor too low. There is a lot of rain and sunshine，too. They are really good places for wildlife. Offering food and home for some special kinds of animals and birds is not the only reason why we need to protect wetlands.

Wetlands are important because they also prevent flood. But some people want to change the wetlands to make more space for farms and buildings. This means there will be less and less space for wildlife.

Luckily, more and more people are beginning to realize the important of wetlands and wildlife. Every year, on February 2nd many activities are held to tell people more about wetlands around the world.

1. Which animal is mentioned in the passage?

A                  B                   C                 D

2.Usually the weather in the wetlands is ____.

A．hot              B．mild              C．cold              D．dry

3.The reasons for protecting wetlands are the following except that ______

A．they are home of wildlife

B．they can prevent flood

C．they offer food to the wildlife

D．they will be good farmland

4. What can be the best title for the passage?

A．China’s wetlands –the Biggest One in the World

B．Wetlands --- Home of Wildlife and Human Beings

C．Special Animals --- Found in Yellow Sea Wetlands

D．Wetlands --- the Last Valuable Land on the Earth

高二英语阅读理解中等难度题查看答案及解析

The oldest stone buildings in the world are the pyramids. _1._. There are over eighty of them scattered(分散,撒布) along the banks of the Nile, some of which are different in shape from the true pyramids. The most famous of these are the “step” pyramid and “ Bent ”pyramid.

Some of the pyramids still look much the same as they must have done when they were built thousands of years ago. Most of the damage suffered by the others has been at the hands of men who were looking for treasure or, more often, for stone to use in modern buildings.__ 2.__. These are good reasons why they can still be seen today, but perhaps the most important is that they were planned to last forever. __3._. However, there are no writings or pictures to show us how the Egyptians planned or built the pyramids themselves. _4._. Nevertheless(然而), by examining the actual pyramids and various tools which have been found, archaeologists have formed a fairly clear picture of them.

One thing is certain: there must have been months of careful planning before they could begin to build. __5.__. You may think this would have been easy with miles and miles of empty desert around, but a pyramid could not be built just anywhere. Certain rules had to be followed, and certain problems had to be overcome.

A．The dry climate of Egypt has helped to preserve(保护) the pyramids, and their very shape have made them less likely to fall into ruin.

B．It is practically certain that plans were made for the building of the

pyramids because the plans of other large works have fortunately been preserved.

C．The first thing they had to do was to choose a suitable place.

D．Consequently, we are only able to guess at the methods used.

E．Many people were killed while building the pyramids.

F．They have stood for nearly 5,000 years, and it seems likely that they will

continue to stand for thousands of years yet.

G．It takes workers twenty years to build the Pyramids.

高二英语其他题简单题查看答案及解析

The oldest stone buildings in the world are the pyramids. __66__. There are over eighty of them scattered along the banks of the Nile, some of which are different in shape from the true pyramids. The most famous of these are the “step” pyramid and “ Bent ”pyramid.

Some of the pyramids still look much the same as they must have done when they were built thousands of years ago. Most of the damage suffered by the others has been at the hands of men who were looking for treasure or, more often, for stone to use in modern buildings.__67__. These are good reasons why they can still be seen today, but perhaps the most important is that they were planned to last forever. __68__. However, there are no writings or pictures to show us how the Egyptians planned or built the pyramids themselves. __69__. Nevertheless, by examining the actual pyramids and various tools which have been found, archaeologists have formed a fairly clear picture of them.

One thing is certain: there must have been months of careful planning before they could begin to build. __70__. You may think this would have been easy with miles and miles of empty desert around, but a pyramid could not be built just anywhere. Certain rules had to be followed, and certain problems had to be overcome.

E. Many people were killed while building the pyramids.

F. They have stood for nearly 5,000 years, and it seems likely that they will

continue to stand for thousands of years yet.

G. It takes workers twenty years to build the Pyramids.

高二英语信息匹配中等难度题查看答案及解析

All efforts of cloning an animal will be ________ if there is not enough diversity in the group to overcome illness.

高二英语单项填空中等难度题查看答案及解析

There are about fifteen hundred languages in the world. But 36a few of them are very 37  .English is one of these. Many, many people use it, not only in England and the U.S.A., but in other parts of the world. About 200,000,000 speak it as their own language. It is difficult to say how many people are learning it as a38language. Many millions are 39 to do so. Is it easy or difficult to learn English? Different people may have different 40 Have you ever 41 ads of this kind in the newspapers or magazines? "Learn English in six weeks, or your 42 back..." "Easy and funny! Our records and tapes 43 you master your English in a month. 44the first day your 45 will be excellent. Just send …"Of course, it never 46 quite like this.

The only language that seems easy to learn is the mother tongue. We should 47 that we all learned our own language well when we were 48. If we could learn English in the same way, it would not seem so difficult. 49 what a small child does. He listens to what people say. He tries what he hears. When he is using the language, talking in it, 50  in it all the time. Just imagine how much 51 that gets!

So it is52to say that learning English is easy, because a good command of English 53upon a lot of practice. And practice needs great effort and 54 much time. Good teachers, records, tapes, books, and dictionaries will 55. But they cannot do the student's work for him.

1.                A．not            B．quite           C．only D．very

2.                A．difficult         B．important       C．helpful   D．easy

3.                A．native          B．foreign         C．useful    D．mother

4.                A．learning        B．enjoying        C．trying    D．liking

5.                A．questions       B．problems       C．ideas D．answers

6.                A．found          B．watched        C．noticed   D．known

7.                A．knowledge      B．time           C．money   D．English

8.                A．make          B．help           C．let   D．allow

9.                A．From          B．On            C．Since D．After

10.               A．spelling        B．grammar        C．English    D．pronunciation

11.               A．happened      B．looked         C．seemed   D．felt

12.               A．know          B．remember      C．understand D．think

13.               A．students        B．children        C．babies D．grown-ups

14.               A．Imagine        B．Mind          C．Do   D．Think of

15.               A．using          B．thinking        C．trying D．practicing

16.               A．time           B．money         C．language  D．practice

17.               A．hard           B．easy           C．funny D．silly

18.               A．depends        B．tries           C．has   D．takes

19.               A．uses           B．takes          C．gets  D．costs

20.               A．do            B．work           C．help  D．master

高二英语完型填空中等难度题查看答案及解析

In most parts of the world, as far back as anyone can remember , there has been a puppet（木偶）tradition. Although some of us think of puppets as children’s entertainment, they were----and oftenstill are used to tell serious stories to adult audiences. Even in these days of special effects, the puppettheatre still has a special place in many cultures.

The best known puppet characters in Britain are Punch and Judy, glove puppets with woodenheads. In summer, one basic play of about half an hour is performed on beaches all around Britain .Mr. Punch, who has an enormous nose and wears a curved hat, gets into trouble and has argumentswith his wife, Judy. A policeman , a crocodile, and a hangman, and all of them run after Mr. Punch .He ,of course, invariably manages to survive to fight another day .

In Belgium wooden puppets first appeared in the 1820s in cities like liege . The liege puppetsare in fact string puppets without strings！They have a single rod（棒）attached to their heads, whichmeans the puppeteers aren’t able to raise the arms and legs, but can move the body up and down and the head from side to side. Many of the stories used to be historical or religious but it is Tchantches,a comic character wit patched trousers and a big black hat, who is the best loved character today. LikeMr. Punch, he is a simple man who is also greedy, quarrelsome and lazy. He makes fun of everyone, but is often warm--hearted and tender.

1.We can learn from the first paragraph that______________.

A. puppets are much more popular nowadays .

B. people prefer puppets to special effects

C. puppets were mainly intended for children

D. people used puppets to make fun for adults

2.The underlined word “invariably”in paragraph 2 is closest in meaning to___________.

A. constantly　　 B. naturally

C. immediately　 D. bravely

3.The biggest difference between puppets in Britain and puppets in Belgium is their___________.

A. performing time

B. operating ways

C. producing material

D. decorating characters

4.The passage is mainly about__________________.

A. different kinds of puppets

B. how puppets came into being

C. why puppets are popular

D. story---telling through puppets

高二英语阅读理解困难题查看答案及解析