British and American scientists are raising genetically modified(轉(zhuǎn)基因的) pigs in the hope of providing organs for transplant(移植) to humans, the project leader wrote in a newspaper Sunday.
Scientists in London and California have begun conducting the genetic experiments to find a solution to record–long waiting lists for organ transplants, Robert Winston said in an opinion piece written for Britain's Sunday Times.
In Britain alone, around 8,000 patients are waiting for a transplant.
"People needing a new heart or liver are waiting for someone else to die – usually a violent death in a traffic accident," Winston wrote in the newspaper. He said his team was "trying to modify pigs so their organs might save the lives of humans."
The scientists are introducing human genes into the animals to reduce the chances of the organs being rejected by patients, as has been common in previous attempts to use animal tissues, said Winston, who heads the Institute of Reproductive and Developmental Biology at London's Hammersmith Hospital.
Working with Dr. Carol Redhead of the California Institute of Technology, Winston's team has injected human genes directly into male piglets(豬仔), adding them to the animal's sperm(精子).
He said that pigs involved in experiments had successfully produced transgenic sperm, but acknowledged that British and European laws had prevented the team from using the pigs to mate.
The Sunday Times newspaper reported that the experiments would be moved to the United States following difficulties with funding and regulations in Britain. It said the pigs would be bred in Missouri.
"Our U.S. friends will benefit from our technology and the income we might have produced for Britain will be lost," Winston wrote.
Some scientists have previously blamed the idea of using animal organs for human transplant, saying the technique risks spreading animal viruses to humans. Winston said his research project is attempting to breed virus-free pigs.
49. Scientists are introducing human genes into the animals to ____________.
A. make the organs healthier
B. reduce the pain of animals
C. make the organs live longer
D. reduce the chances of rejection
50. Some scientists have blamed the idea of using animal organs for human transplant because ____________.
A. the technique is not perfect now
B. humans may be infected with animal viruses
C. it is against laws and regulations
D. it may cause a conflict between humans and animals
51. According to Winston, it seems ___________ to Britain to move the experiments to the United States.            
A. a pity
B. a pride
C. a disaster
D. a good idea
52. It can be inferred from the passage that ____________.
A. animal organs are commonly used for human transplant now
B. lots of patients need animal organ transplants now
C. examples of the animal tissues being rejected have happened
D. it is not safe to use animal organs for human transplant
練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中英語 來源:不詳 題型:完形填空

Directions: Read the following passage. Complete the diagram by using the information from the passage.
Write NO MORE THAN THREE WORDS for each answer.
Rest is critical to life and work and a positive attitude towards rest needs to be maintained, for enough rest is significant to our body and mind while a lack of adequate rest, as well as misleading attitudes to rest, will do great harm to our health.
Rest is vital to our ability to function at our best. Recent news stories report that scientists are learning surprising things about the importance of sleep. There is enough evidence suggesting that rest will refresh us, enabling our body and mind to work efficiently. Besides, rest is important for more than that; it is helpful in setting appropriate goals and deciding what goals to attain first. Those who are caught up in extremely busy lives lack the time to think about what they are doing and to make objective decisions, which blocks the maximization of their potential.  
On the contrary, lack of adequate rest damages brain function, so much so that sleep experts have been able to measure drops in IQ in patients who are short of sleep. Other studies have presented a negative effect on body movements in sleep-wanting subjects. It should not, therefore, be a surprise that the California Highway Patrol has stated that sleep-wanting drivers are as great a threat to road safety as are drunk drivers.
However, rest is widely misunderstood by some people. Instead of sleep, they go to pubs and clubs and claim that this kind of entertaining is rest. For example, what they call social drinking or having a smoke with friends. Nowadays, the economy forces people to drink and gamble for the sake of the circles one moves in. This is what fools claim thoughtlessly that it’s restful. The truth is that rest means not using our labor both physically and mentally, even spiritually.
We need to rest correctly and sufficiently; otherwise, tiredness and illness will occur. Without sufficient rest, good work is impossible.Rest is critical; it is not an end in itself.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

On June 5, 1981 the Centers for Disease Control in Atlanta, U.S. announced the presence of a rare, infectious disease in five American homosexuals(同性戀). Soon doctors were finding similar cases all over the country and the world. The AIDS epidemic(流行病)had officially begun. By 1983 it was clear that AIDS had spread around the world. More than twenty years later, AIDS has left twenty-six million dead and another forty million infected.  AIDS has become the worst medical disaster ever experienced by mankind.
Hundreds of young people between the ages of 20 and 45 died each week during the early years of the U.S. AIDS. More than 600,000 cases of AIDS have been reported since 1981 in the United States, and it is estimated that there may be as many as 900,000 Americans infected with HIV.
Though the rate of HIV infections continues to increase in the United States, the number of AIDS cases has fallen sharply since 1996, when antiretroviral drugs came onto the market. Unfortunately, the AIDS epidemic continues today in Africa and much of Asia, where antiretroviral treatment is not available and health care is far from enough. AIDS is the fourth leading cause of death worldwide, and the No. 1 cause of death due to infectious disease.
HIV, the virus that causes AIDS, was first separated in 1983 by a team at the Pasteur Institute in Paris. That discovery made it possible to develop a test for AIDS and trace back to victims who may have died before doctors were aware of the disease.
However, scientists still don't know exactly how and where AIDS started. Finding the source of AIDS could be important in developing a vaccine(疫苗) and be important in mapping the future course of the epidemic.
小題1:It can be inferred from the passage that       
A.a(chǎn)ntiretroviral drugs will be obtained easily all over the world
B.the best way to stop AIDS is to develop a vaccine
B.scientists will soon find a way to cure AIDS
D.there will be fewer AIDS cases in the world in the future
小題2:Which areas are the most worrying places where AIDS spreads quickly? 
A.Africa.B.Asia.C.The United States.D.France.
小題3:The number of AIDS cases has greatly decreased in the United States due to the fact
A.a(chǎn) team at the Pasteur Institute in Paris succeeded in separating HIV
B.some effective medicine has been invented
B.scientists understand AIDS better and better.
D.The rate of HIV infections continue to rise in the United States
小題4:What's the importance of the discovery of the source of AIDS?
A.It can be used to develop a test for AIDS.
B.It can stop HIV forming AIDS.
B.It can reduce the rate of death caused by AIDS.
D.It can help develop a drug to prevent AIDS.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


Here’s a quick reminder to all of you when you get stuck in a moment. Yesterday I skipped breakfast because I got up late. Because of the busy school work, I forgot my lunch. When I was finally thinking of buying my lunch, a person in need asked me if I could spare him some cash, so I decided to give him some money.
Then later in the evening, I was heading home anxiously for dinner. However, I got a call from my mom. She said that she had to work late and wouldn’t be able to prepare dinner for me. Even though there was no food in the house, I told my mom not to worry as I would surely find myself something to eat.
While I was still processing this sudden set of changes in my food choice for the day, I passed a young man with a broad smile handing out samples of crackers(薄脆餅干) at the gate of a supermarket. He gave me a packet and then said, “How about you taking some more for school tomorrow?” In response to that, I returned a warm smile to him and opened up my bag. He gladly filled it. I was excited.
Whether you call it luck or fate, I just wanted to say that somewhere out there somebody came along carrying a pocket of hope in his heart and shared a piece of with me! Somebody out there will one day do the same for you.!
1. The author anxiously went home for dinner in evening because __________.
A. his mother was waiting for him to have dinner
B. his mother promised to prepare dinner for him
C. he hadn’t had breakfast or lunch
D. he didn’t like food in restaurants
2. What’s the time order of the following events that happened to the author?
a. Gave money to person in need
b. Learn he had to organize his own dinner
c. Went home hurriedly for dinner
d. Got a lot of crackers
A. b—d—a—c    B. a—c—b—d      C. a—d—b—c     D. d—c—a—b
3. The purpose of the passage is to _________.
A. advise us to study hard at school.     B. show that life is full of unexpected things
C. suggest that people take three meals every day   D. tell us there is always hope

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Scientists say they have discovered a promising treatment for sleeping sickness, a killer disease that infects(感染) about 60,000 people in Africa a year.
British and Canadian experts say drugs could attack the parasite(寄生蟲) causing the illness needs to survive. They say the drug could be ready for human medical test in about 18 months.
The disease, spread by the bite of a fly, is caused by a parasite attacking the central nervous system. It has similar symptoms(癥狀) to malaria(瘧疾), making it difficult to diagnose. Left untreated, it moves to the brain, resulting in mental confusion and final death
The "breakthrough" came at the University of Dundee in Scotland, where scientists were offered money to research diseases ignored by major drugs companies.
Professor Paul Wyatt, director of the programme, said: "This is one of the most significant findings made in recent years in terms of drug discovery and development for ignored diseases."
He said the research, published in the journal Nature, represented "significant progress" in the development of a full blown drug against the disease.
The World Health Organization said there are between 50,000 and 70,000 cases of the disease a year, with a further 60 million people at risk of infection.
The research in Dundee was backed by partners at the University of York in England and the Structural Genomics Consortium in Toronto, Canada. The two drugs currently available to treat sleeping sickness both have problems. One is with side effects that kill one in 20 patients and the other is costly, only partially effective and requires long-time hospital treatment, the scientists said.
小題1:The word backedin the last paragraph probably means_____.
A.conductedB.supportedC.believedD.managed
小題2:What the World Health Organization said suggested that______.
A.a(chǎn)bout 60000 people died of the disease each year
B.a(chǎn)bout 60000 people were cured of the disease each year
C.600 million people are likely to get infected
D.the disease is spreading fast in Africa
小題3:We can read this passage______.
A.in the journal Nature
B.in a newspaper of the University of Dundee
C.in a book about flies
D.in a newspaper about medicine
小題4:We can learn from the passage that______ .
A.big drug companies play an important role in the research of the new drug
B.people who get infected with the disease are mentally disturbed
C.a(chǎn)mong 200 people infected with the disease, 5 may die because of the old drug
D. Professor Paul Wyatt may be a professor at the University of York

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


First it was jogging. Then aerobics(有氧運(yùn)動(dòng)). Not too long ago, Americans discovered race walking.
Now Americans are into a new fitness craze. They’re taking up bicycling. Over hills and down mountainsides and across quiet country roads, Americans are busily rolling along.
The number of adults who ride for fitness is around 17 million, an increase of 70 percent over four years ago. Twice as many women as men are coming to the sport. Americans are falling in love with biking because it has speed, the benefits of jogging and beautiful scenery.
Bicycling is a very appropriate sport, which is important to people who injured their knees while jogging or whose joints are aching from aerobics. And biking is a real awakening for people who have been into race walking in the past. Race walking is as dull as watching paint dry.
The most popular kind of bicycle for people who are new to the sport is the mountain bike, which has a fixed frame with wide tires and upright handles. Mountain bikes also have many gears(齒輪) to make it easier to climb hills. About 5 million Americans ride mountain bikes, compared with 200,000 who rode them only five years ago.
Costs range from about $130 for a bottom-of-the-line bicycle to more than $2,700 for an expensive bicycle.
Mountain biking has attracted some people who race down the sides of mountains like a bat out of hell. But most riders ride slowly and they rarely venture far from home.
The biking craze has brought an unexpected profit(盈利) to clothing and bicycle accessory(附屬品)makers. Last year, bikers paid $630 million for biking clothes and accessories.
Bicycling seems likely to continue its fantastic growth.
53. Race walking is about as dull as watching paint dry because _______         
A. race walking is a slow-moving sport
B. the number of adults who ride for fitness has grown 70 percent in four years.
C. it has speed, the benefits of jogging and beautiful scenery.
D. Americans are taking up bicycling.
54. The bicycling craze has been a profit for _______.
A. people who want to ride like a bat out of hell
B. bicycle accessory makers
C. race walkers
D. twice as many women as men
55. What does the underlined word “bottom-of-the-line” mean?
A. poor       B. modern    C. old        D. cheapest
56. The main idea of the article is _______
A. riding a bicycle is one of the most dangerous sports in America
B. Americans are rolling along
C. bicycling is the latest fitness craze to hit America
D. most people in America want to own a hand-made bicycle that can cost more than 2,700

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


B
Many people catch a cold in the springtime or fall. It makes us wonder. If scientists can send a man to the moon, why can’t they find a way to deal with the common cold? The answer is easy. There are actually hundreds of kinds of cold viruses out there. You never know which one you will get, so there isn’t a cure for each one.
When a virus attacks your body, your body works hard to get rid of it. Blood rushes to your nose and brings congestion(擁塞)in it. That is to say, you cannot breathe well. As a result, you feel terrible. However, your body is actually “eating” the virus. Your temperature rises and you get a fever, but the heat of your body is also killing the virus. Besides, you have a runny nose to stop the virus from getting into you. You may feel terrible, but in fact your wonderful body is doing everything it can to kill the cold.
Different people have different ways to deal with common colds. In the United States and some other countries, for example, people might eat chicken soup to feel better. Some people take hot baths; some drink warm water, milk, or things like that; other people take medicine to stop the fever, congestion, and runny nose.
Some scientists suggest you should not take medicine when having a common cold, saying that it is bad for you to do that. If you take medicine, your body will stop reacting to the virus and thus won’t have a way to fight it and kill it, which makes the virus stay in you longer. Bodies can do an amazing job on their own.
56. According to the passage, what makes us wonder?
A. Why we never know which cold we will get.
B. Why scientists are able to send a man to the moon.
C. Why scientists cannot find a cure for the common cold.
D. Why there are hundreds of kinds of cold viruses out there.
57. Which of the following is NOT mentioned in the passage when we are suffering from colds?
A. Fever.       B. Headache.      C. Runny nose.       D. Congestion.
58. When you have congestion in your nose, ________.
A. you will not be able to breathe well
B. your temperature is going to rise
C. your blood is running too fast
D. you will have a runny nose
59. According to the passage, people may deal with common colds in different ways EXCEPT ________.
A. taking medicine   B. taking hot baths   C. eating chicken soup   D. drinking alcohol
60. Some scientists advise you not to take medicine when you have a common cold because _______.
A. your body will fight and kill the virus on its own
B. your body will probably react too much to the virus
C. it will take longer time for your body to get over the virus
D. it will not be able to stop the fever, congestion or runny nose

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


C
Arthritis, stroke, osteoporosis(骨關(guān)節(jié)炎), heart disease and dementia are what we’ve got to look forward to in old age. But conditions like these don’t have to be impossible to avoid, says New Zealand cook Robyn Martin. She firmly believes that we are what we eat and we can choose to consume foods that can slow the aging process and even prevent certain illnesses. That’s why her latest cookbook is devoted to recipes that use ingredients with a large number of anti-aging benefits. Stop the Clock—the Anti-Aging cookbook looks at a variety of health problems—from brain decline and joint aches and pains to heart disease and high cholesterol(膽固醇)—then lists foods that can improve or prevent them and offers a selection of recipes using those ingredients. “I wrote this book so I can offer people lots of information about foods that can give them a better old age.”
Six foods that can help slow the aging process:
1. Lentils
The important substance included in lentils is the one that can help you avoid the unpleasant symptoms of menopause(更年期), like mood swings.
2. Blueberries
Blueberries slow and, in some cases, reverse damage in aging brains. They are also rich in some chemicals which keep your looking young and help relieve arthritic(關(guān)節(jié)炎的) pain.
3. Carrots
Carrots have high levels of beta-carotene, which changes to vitamin A in the body. So they may help with memory, do good to the skin and are also thought to lower cholesterol.
4. Oats
The protein, calcium and phosphorus in oats all help build strong bones and connective tissue. The fibre they contain helps lower cholesterol and high blood pressure.
5. Spinach
Spinach is a good source of two important substances involved in protecting the DNA in our cells from oxication(氧化). It not only helps to strengthen the memory and turn off genes that can step up aging, but also can help improve the symptoms of osteoarthritis.
6. Soy
Soy products help lower blood pressure and cholesterol levels and are rich in phytoestrogens, which can help prevent hormone-related cancers. Soy can also be helpful to the skin, making it firm and youthful.
Did you know? Tomatoes contain a powerful substance which is not only useful for preventing problems in the heart, and lungs, but also prevents diseases like cancer. To gain the most benefit, tomatoes should be cooked.
64. If memory often fails you, which of the following combination will be good to you?
A. soy and carrots                                            B. oats and soy
C. lentils and blueberries                                          D. carrots and spinach
65. This passage mainly deals with _____.
A. foods and ingredients  B. foods and health  C. foods and nutrition     D. foods and diseases
66. The passage is written _____.
A. to tell the readers recipes play an important role in keeping healthy
B. to advertise the foods mentioned in the passage
C. to tell the readers how to slow the aging process
D. to tell the readers how to cure some diseases by taking right foods

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


D
Everyone knows you must exercise regularly to keep good health. Indeed, staying physically fit is a big part of our culture. we consider(or rightly so)that healthy people are attractive people. Since most of us want to be attractive, there is no shortage of exercise clubs, training videos, magazines and books offering to help us stay physically fit.
Unfortunately, however, our culture doesn’t place the same emphasis on mental fitness. Although we tend to like men and women with strong, healthy-looking bodies, we don’t have the same degree of respect or attraction for smart, educated, mentally healthy people. This is a pity, because there are great rewards for people who have developed the ability to think well.
If your mind is well trained and flexible, you will be able to understand a great deal of what happens around you. And if you are also well educated --- that is, if you understand basic science, mathematics, music, art, literature, history and so on --- you will find it much easier to make good decisions throughout your life. Over the long run, this leads to a sense of control over your destiny and a much better life than otherwise.
People who are poorly educated or who don’t think well --- that is, people who are not mentally fit --- see things differently. Their world is controlled by mysterious, often malevolent(惡意的)forces. Such people live within a system they will never master, forced to follow rules they will never understand. Although it may not be obvious, most spend their lives being manipulated(控制)by others. They are told what to do, what to think, how to spend their money, and what they should and should not aspire(渴望)to in life.
In my opinion, if you want to live well, you must be able to use your mind well. For this reason, I want you to be able to concentrate, to solve problems, to understand complex ideas, and to think clearly and quickly. Such skills will make it easier for you to make informed decisions, understand current events, choose good friends, manage your money well, make wise lone-term decisions and appreciate music, art and literature.
The key to developing such skills is to enjoy learning, and to have the ability and motivation to teach yourself.
63. The writer of the passage feel disappointed that ____.
A. too little has been done to help people to keep physically fit
B. too much has been done to help people to keep physically fit
C. mentally healthy people are not as popular as physically healthy people
D. physically healthy people are not as popular as mentally healthy people
64. The underlined word “this” in the 3rd paragraph means ____.
A. the understanding of a great deal of what goes on around you
B. the understanding of basic science and mathematics
C. good training in body and mind
D. being able to make good decisions in life
65. The writer of this passage thinks those who are not mentally fit ____.
A. live a poor and mysterious life   B. can’t control over their life
C. often do what others do        D. enjoy being fooled and ruled
66. The best title of the passage will most probably be ____.
A. Train Your Body                  B. Train Your Mind  
C. Make Informed Decisions       D. Think Hard and Work Hard

查看答案和解析>>

同步練習(xí)冊答案