The researchers, led by Hwang Woo-suk, insist they cloned an Afghan hound, only to help investigate (研究) human disease, including the possibility of cloning stem cells (干细胞) for treatment purposes.
But others immediately renewed calls for a global ban (禁令)on human reproductive cloning before the technology moves any farther.
"Successful cloning of an increasing number of species confirms the general impression that it would be possible to clone any species of mammals, including humans," said Ian Wilmut, a reproductive biologist at the University of Edinburgh who produced the first cloned mammal, Dolly the sheep, from an adult cell nearly a decade ago.
Researchers have since cloned cats, goats, cows, mice, pigs, rabbits, horses, deer, mules and gaur, a large wild ox of Southeast Asia. So far, efforts to clone a monkey or another primate with the same techniques have failed.
Uncertainties about the health and life span (寿命) of cloned animals continue to exist; Dolly died at a young age in 2003 after developing cancer and arthritis.
Wilmut and others complimented Hwang's achievement, reported Wednesday in the journal Nature. But they said politicians and scientists must face the larger issue — how to go on with the research without crossing the moral boundary of copying human life in the lab.
"The ability to use the technology is hopeful," said Robert Schenken, president of the American Society for Reproductive Medicine. "However, the paper also points out that in dogs as in most species, cloning for reproductive purposes is unsafe."
The cloned puppy was the lone success from more than 100 dogs implanted (嵌入)with more than 1,000 cloned embryos.
In a news conference in Seoul, the cloning team also condemned(谴责)the reproductive cloning of humans as "unsafe and inefficient." Human reproductive cloning already is banned in South Korea. Other nations, including the United States, are divided on whether to ban just human cloning or cloning of all kinds, including the production of stem cells.
56. An Afghan hound is a kind of ______.
A. cat B. goat c. cow D. dog
57. A ______ is a large wild ox of Southeast Asia.
A. horse B. deer C. mules D. gaur
58. Accrding to the passage, scientists haven’t been able to clone a ______ so far.
A. deer B. mule C. mouse D. monkey
59. The underlined word complimented is probably similar in meaning to ______.
A. praised B. doubted C. refused D. gave up
60. The cloning of human beings is banned in ______.
A. South Korea B. the United States
C. both South Korea and the United States D. neither South Korea nor the United States
高二英语阅读理解简单题
The researchers, led by Hwang Woo-suk, insist they cloned an Afghan hound, only to help investigate (研究) human disease, including the possibility of cloning stem cells (干细胞) for treatment purposes.
But others immediately renewed calls for a global ban on human reproductive cloning before the technology moves any farther.
“Successful cloning of an increasing number of species confirms the general impression that it would be possible to clone any species of mammals, including humans,” said Ian Wilmut, a reproductive biologist at the University of Edinburgh who produced the first cloned mammal, Dolly the sheep, from an adult cell nearly a decade ago.
Researchers have since cloned cats, goats, cows, mice, pigs, rabbits, horses, deer, mules and gaur, a large wild ox of Southeast Asia. So far, efforts to clone a monkey or another primate with the same techniques have failed.
Uncertainties about the health and life span (寿命) of cloned animals continue to exsist; Dolly died at a young age in 2003 after developing cancer and arthritis.
Wilmut and others complimented Hwang’s achievement, reported Wednesday in the journal Nature. But they said politicians and scientists must face the larger issue — how to go on with the research without crossing the moral boundary of copying human life in the lab.
“The ability to use the technology is hopeful,” said Robert Schenken, president of the American Society for Reproductive Medicine. “However, the paper also points out that in dogs as in most species, cloning for reproductive purposes is unsafe.”
The cloned puppy was the lone success from more than 100 dogs implanted (嵌入)with more than 1,000 cloned embryos.
In a news conference in Seoul, the cloning team also condemned the reproductive cloning of humans as “unsafe and inefficient.” Human reproductive cloning already is banned in South Korea. Other nations, including the United States, are divided on whether to ban just human cloning or cloning of all kinds, including the production of stem cells.
1. An Afghan hound is a kind of ______.
A. cat B. dog C. cow D. goat
2. A ______ is a large wild ox of Southeast Asia.
A. horse B. deer C. mules D. gaur
3.Accrding to the passage, scientists haven’t been able to clone a ______ so far.
A. deer B. mule C. monkey D. mouse
4.The underlined word complimented is probably similar in meaning to ______.
A. praised B. doubted C. refused D. gave up
5.The cloning of human beings is banned in ______.
A. South Korea
B. the United States
C. both South Korea and the United States
D. neither South Korea nor the United States
高二英语阅读理解简单题查看答案及解析
The researchers, led by Hwang Woo-suk, insist they cloned an Afghan hound, only to help investigate (研究) human disease, including the possibility of cloning stem cells (干细胞) for treatment purposes.
But others immediately renewed calls for a global ban (禁令)on human reproductive cloning before the technology moves any farther.
"Successful cloning of an increasing number of species confirms the general impression that it would be possible to clone any species of mammals, including humans," said Ian Wilmut, a reproductive biologist at the University of Edinburgh who produced the first cloned mammal, Dolly the sheep, from an adult cell nearly a decade ago.
Researchers have since cloned cats, goats, cows, mice, pigs, rabbits, horses, deer, mules and gaur, a large wild ox of Southeast Asia. So far, efforts to clone a monkey or another primate with the same techniques have failed.
Uncertainties about the health and life span (寿命) of cloned animals continue to exist; Dolly died at a young age in 2003 after developing cancer and arthritis.
Wilmut and others complimented Hwang's achievement, reported Wednesday in the journal Nature. But they said politicians and scientists must face the larger issue — how to go on with the research without crossing the moral boundary of copying human life in the lab.
"The ability to use the technology is hopeful," said Robert Schenken, president of the American Society for Reproductive Medicine. "However, the paper also points out that in dogs as in most species, cloning for reproductive purposes is unsafe."
The cloned puppy was the lone success from more than 100 dogs implanted (嵌入)with more than 1,000 cloned embryos.
In a news conference in Seoul, the cloning team also condemned(谴责)the reproductive cloning of humans as "unsafe and inefficient." Human reproductive cloning already is banned in South Korea. Other nations, including the United States, are divided on whether to ban just human cloning or cloning of all kinds, including the production of stem cells.
56. An Afghan hound is a kind of ______.
A. cat B. goat c. cow D. dog
57. A ______ is a large wild ox of Southeast Asia.
A. horse B. deer C. mules D. gaur
58. Accrding to the passage, scientists haven’t been able to clone a ______ so far.
A. deer B. mule C. mouse D. monkey
59. The underlined word complimented is probably similar in meaning to ______.
A. praised B. doubted C. refused D. gave up
60. The cloning of human beings is banned in ______.
A. South Korea B. the United States
C. both South Korea and the United States D. neither South Korea nor the United States
高二英语阅读理解简单题查看答案及解析
Animals can be reproduced by technology now; researchers can clone them. A clone is an exact copy of another animal or plant. Scientists have cloned a sheep which they have named Dolly. Researchers took genes from a ewe (母羊) and used them to create a copy (Dolly) of the ewe.
Why are scientists doing this research? One reason is to get information about genes so they can improve our health. They also want to learn how better farm animals can be produced. Cloning is a controversial issue for people. Some people think it is good because this research can help us, but other people think cloning is unacceptable. Some people think it might be possible to save endangered animals by cloning them. Tigers, elephants, and other endangered animals might be saved in this way.
In China, pandas are endangered because they are hunted and they are losing their habitat, so some Chinese scientists want to try to clone pandas to save them from extinction.
I don’t really like the idea of cloning animals, but I don’t think I want panda to become extinct. If the best way to save them is to make cloned pandas, they must be cloned.
I want to live with a lot of animals and nature. I don’t want animals to die out, especially pandas. I think humans must think more about protecting animals and nature. Maybe cloning is the way to save all endangered animals.
1.What is Dolly like?
A. It is like other ordinary sheep we often see.
B. It is a bit like the ewe.
C. It is exactly like the ewe researchers took genes from.
D. It is like a perfect sheep that researchers want to make.
2.What is the technology scientists use to clone animals?
A. They use the technology of animal improvement.
B. they take genes from an animal and use them to make a copy of it.
C. They change the genes of a ewe and then get them improved.
D. They combine advantages of some animals to make a better one.
3.By studying cloning, scientists can____.
A. make copies of many famous people in the world.
B. start a new industry where many more people may find jobs.
C. find ways to feed the whole world.
D. improve our health and produce fine animals.
4.From the passage we can learn that____.
A. people are all for the technology of cloning.
B. only scientists are interested in cloning.
C. people don’t hold the same opinion about cloning.
D. all the people think cloning unacceptable.
高二英语阅读理解中等难度题查看答案及解析
Despite barriers and hardships，they ______ the research on cloning tissues.
A. come up with B. catch up with
C. push ahead with D. put up with
高二英语单项填空简单题查看答案及解析
I am _____ first cloned monkey and I was born at _____ research center in the USA.
A. the; a B. an; the C. /; a D. the; the
高二英语单项填空简单题查看答案及解析
A latest research led by researchers from the National University of Singapore (NUS) has found a clear link between the color of a taxi and its accident rate. An analysis of 36 months of detailed taxi, driver and accident data from two fleets of yellow and blue taxis in Singapore suggested that yellow taxis have fewer accidents than blue taxis. The higher visibility of yellow makes it less difficult for drivers to avoid getting into accidents with yellow taxis, leading to a lower accident rate.
The study was led by Prof Hou. To test whether there was a relationship between the color of a taxi and the number of accidents the taxi had, the research team analyzed data collected by the largest taxi company in Singapore. The researchers found that yellow taxis have about 6.1 fewer accidents per 1,000 taxis per month.
They also studied the economic effect of changing the color of the entire fleet of taxis to yellow. The Singapore taxi company involved in the study owns about 16,700 taxis in a ratio (比例) of one yellow to three blue taxis. If a commercial decision is made to switch from blue to yellow taxis, 76.6 fewer accidents will occur per month or 917 fewer accidents per year.
Assuming an average repair cost of $1,000 per car and a downtime of six days, the color of all taxis to yellow could produce an annual saving of $2 million.
“We are eager to continue to validate(证实) the findings of our study by looking at the use of yellow in other types of public transport, such as school buses. For example, we hope to compare the accident rates of yellow school buses against those of other colors to find out if yellow is indeed a safer color for school buses. Besides, we’re also interested to look at private-hire vehicles and do a comparison of the accident rates of vehicles that are of different colors, ”explained Prof Hou.
1.Why do yellow taxis result in fewer accidents?
A. Because yellow can be seen more easily.
B. Because yellow signals a warning of danger.
C. Because drivers tend to be more careful in yellow taxis.
D. Because people act more quickly in yellow surroundings.
2.What’s Prof Hou’s study based on?
A. Physical risks of taxi passengers’ experience.
B. The economic effect of changing taxi color.
C. Personal reports from taxi drivers worldwide.
D. Data from Singapore's largest taxi company.
3.What do Prof Hou’s words in the last paragraph suggest?
A. School buses should be painted yellow. B. Their findings are worth popularizing.
C. Their study will be furthered. D. Yellow should be widely used in public transport.
4.What can be the best title for the text?
A. Safer to ride in yellow taxis B. Caution: yellow taxis ahead
C. Why are yellow Taxis preferred? D. How can colors help prevent accidents?
高二英语阅读理解中等难度题查看答案及解析
A recent study led by researchers from the National University of Singapore (NUS) has found a clear link between the color of a taxi and its accident rate. An analysis of 36 months of detailed taxi, driver and accident data from two fleets of yellow and blue taxis in Singapore suggested that yellow taxis have fewer accidents than blue taxis. The higher visibility (能见度） of yellow makes it less difficult for drivers to avoid getting into accidents with yellow taxis, leading to a lower accident rate.
The study was led by Prof Ho. To test whether there was a relationship between the color of a taxi and the number of accidents the taxi had, the research team analysed data collected by the largest taxi company in Singapore. The researchers found that yellow taxis have about 6. 1 fewer accidents per 1,000 taxis per month.
They also studied the economic effect of changing the color of the entire fleet of taxis to yellow. The Singapore taxi company involved in the study owns about 16,700 taxis in a ratio (比例) of one yellow to three blue taxis. If a commercial decision is made to switch from blue to yellow taxis, 76. 6 fewer accidents will occur per month or 917 fewer accidents per year.
Assuming an average repair cost of $1,000 per car and a downtime of six days, the color of all taxis to yellow could produce an annual saving of $2 million.
“We are eager to continue to validate (证实) the findings of our study by looking at the use of yellow in other types of public transport, such as school buses. For example, we hope to compare the accident rates of yellow school buses against those of other colors to find out if yellow is indeed a safer color for school buses. Besides, we’ re also interested to look at private-hire vehicles and do a comparison of the accident rates of vehicles that are of different colors explained Prof Ho.
1.Why do yellow taxis result in fewer accidents?
A. Because yellow signals a warning of danger.
B. Because yellow can be seen more easily.
C. Because drivers tend to he more careful in yellow taxis.
D. Because people act more quickly in yellow surroundings.
2.What’ s Prof Ho’s study based on?
A. Physical risks taxi passengers experience.
B. The economic effect of changing taxi color.
C. Personal reports from taxi drivers worldwide.
D. Data from Singapore's largest taxi company.
3.What do Prof Ho’s words in the last paragraph suggest?
A. School buses should be painted yellow.
B. Their findings are worth popularizing.
C. Their study will be furthered.
D. Yellow should be widely used in public transport,
4.What can be the best title for the text?
A. Safer to ride in yellow taxis B. Caution: yellow taxis ahead
C. Why are yellow Taxis preferred? D. How can colors help prevent accidents?
高二英语阅读理解困难题查看答案及解析
The new research team was led by the ________engineer.
A. main B. major C. chief D. primary
高二英语单项填空中等难度题查看答案及解析
Whale researchers believe they have found a new way to measure the amount of stress felt by whales when they experience serious threats, such as being hit by a ship, and they say the technique could help protect the huge sea creatures from dying off.
American Rosalind Rolland is the lead scientist on the project. She and her team are with the New England Aquarium in Boston, Massachusetts. They measured stress hormones (荷尔蒙 ) by studying baleen, a substance found in the upper part of the mouth of some kinds of whale. She explains that the baleen serves as a record that shows a spike in stress hormones when whales face dangers such as a changing climate and ship strikes. Scientists can then read these records, similar to reading the rings on a tree.
Understanding the information is important because whales who often feel stressed are less likely to be reproductive and more likely to become sick. That combination is not good for the whale population, which is already dangerously low.
The scientists did their work on a whale that had become trapped in fishing equipment, which some scientists estimate kills up to 300, 000 whales and dolphins annually. It was finally killed by Inuit hunters who found it trying to drag the fishing equipment. The hunters said the whale seemed to lack energy. When scientists examined the dead whale, they found its mouth showed an increase in stress hormones 20 times greater than normal.
Regina Asmutis-Silvia is a biologist with the Whale and Dolphin Conservation in Massachusetts. She didn’t participate in the research, but she says it is important. “We clearly understand that stress is bad for humans. We also need to understand that stress is bad for other animals, too,” she adds.
1.What does the text mainly tell us?
A.The dangers the whale often faces.
B.The measures to stop sea life being hit.
C.A discovery to measure stress on whales.
D.A way to protect the mouth of the whale.
2.Which of the following can best replace “spike” underlined in Paragraph 2?
A.Rise. B.Change. C.Crash. D.Slide.
3.What may a whale living a stressful life be like?
A.Calm and fierce. B.Unhealthy and unable to reproduce.
C.Uneasy and energetic. D.Sizeable and likely to lose appetite.
4.Why does the author mention the words by Regina?
A.To move on to another topic.
B.To stress the importance of the finding.
C.To tell the necessity of studying other animals.
D.To show the similarity between humans and animals.
高二英语阅读理解简单题查看答案及解析
Born in England in 1944, Ian Wilmut 1.(know)as the leader of the research group that first cloned a female lamb 2.(call)Dolly in 1996. Dolly became famous and pictures of her appeared on the 3.(cover)of magazines all over the world. The 4.(possible)of reproduction without a male and female being involved also made her the focus of a moral debate. For scientists, however, the cloning of dolly using the DNA of an adult cell was a breakthrough 5.showed the cloning of special animals was possible.
However, 6.Wilmut thinks unlikely is human cloning. He says 7.(undertake)the procedure with humans would require 29 surrogate(替代的)mothers and 300 eggs. Of those 29,28 would be bound 8.(experience)failure and suffer physically and emotionally. He says he is also concerned about the psychological and 9.(society)consequences a cloned might have to go through. For these reasons, he is not 10.favor of it.
高二英语短文填空中等难度题查看答案及解析