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Some of the most famous scientific discoveries happened by accident. From the microwave oven to penicillin, scientists trying to solve a problem have sometimes found unexpected things. This is exactly how we created phosphorene nanoribbons (磷烯纳米带) — a material made from one of the universe’s basic building blocks, which has the potential to revolutionize a wide range of technologies.
We'd been trying to separate layers of phosphorus crystals (晶体) into two-dimensional sheets. Instead, our technique created tiny ribbons one single atom thick and only 100 or so atoms across, but up to 100,000 atoms long. We spent three years improving the production process, before announcing our findings. The two-dimensional ribbons have a number of remarkable properties (属性). Their unbelievable width allows their properties, such as whether and how they conduct electricity, to be controllable. They are also very flexible, which means that they can follow any surfaces they’re put on perfectly, and can even be twisted.
More than 100 scientific papers predicted the transformative potential of these ribbons, should it be possible to create them, across a range of technologies — some as many as five years before the publishing of our discovery in Nature. Perhaps the most important of these is in the area of battery technology. The structure of phosphorene nanoribbons means that the charged ions (带电离子) that power batteries could soon move up to 1000 times faster than they currently possible do. This would mean a significant decrease in charging time, alongside an increase in capacity of approximately 50%. Such performance gains would provide massive boosts to the electric car and aircraft industries, and allow us to use renewable energy more readily, even on grey, calm days.
1.What does “we” in the text refer to?
A.Scientists. B.Doctors.
C.Publishers. D.Technicians.
2.What can we know about phosphorene nanoribbons in Paragraph 2?
A.Its shape. B.Its origin.
C.Its structure. D.Its characteristic.
3.What would reduce charging time according to the scientific papers?
A.The cleaner source of energy.
B.The bigger batteries of tiny ribbons.
C.The increasing capacity of batteries.
D.The faster moving speed of charged ions.
4.What does the text mainly introduce to us?
A.The amazing development of battery technology.
B.Significant changes brought by wonderful discoveries.
C.A “Wonder material” created accidentally by scientists.
D.Unexpected inventions made in human’s history.
英语阅读理解中等难度题查看答案及解析
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What are some of the biggest scientific discoveries in the history of humans? How have they changed our lives? Are all the scientists born with creativity?
There was once a famous scientist who made several important discoveries. Once he was asked how he was able to be so creative. He replied that it all came from an experience he had with his mother at the age of 2. He was trying to take a bottle of milk out of the fridge. But the bottle was too slippery and he dropped it. The kitchen was covered in milk.
When his mother came into the kitchen，instead of shouting at him or punishing him，she said，"Robert，what a great and wonderful mess you have made！I have never seen such a huge puddle（水坑）of milk. Would you like to play in the milk for a few minutes before we clean it up?"
So he did. After a few minutes，they cleaned it up together. Then his mother said，"This was a failed experiment（实验）in how to carry a big bottle of milk with two small hands. Let's go out in the backyard and fill the bottle with water and see if you can find a way to carry it without dropping it.”
The little boy learned that if he held the bottle at the top near the mouth with both hands，he could carry it without dropping it. What a wonderful lesson！
The scientist then added that it was at that moment that he knew he didn't need to be afraid to make mistakes. He learned that mistakes are just chances to learn something new which is after all, what scientific experiments are all about. Even if the experiment doesn't "work", we can still learn something valuable from it.
1.Which word in the passage can match the meaning of "being smooth, wet or oily and difficult hold"?
A.failed B.huge C.slippery
2.What did Robert's mother do after he made a mess?
A.She allowed him to play in the mess.
B.She shouted at him and punished him.
C.She didn't allow him to take out milk bottles alone.
3.From the passage, we know Robert________________.
A.started his scientific discoveries at the age of 2
B.used to like drinking milk and be very careless
C.usually treats mistakes as chances to learn something new instead of being afraid of them
4.From the last paragraph, which opinion may the writer support?
A.Mother plays the only important role in children's future life.
B.To be creative, we should keep an open mind about mistakes.
C.Scientific experiments must be valuable.
5.Which of the following words best describes Robert's mother?
A.Careful. B.Smart. C.Strict.
九年级英语阅读单选中等难度题查看答案及解析
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We should all remember that some great scientific discoveries _____________ by chance.
A．gained
B．discovered
C．occurred
D．earned
高一英语单项填空简单题查看答案及解析
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The scientific world continues to be amazed by the speed of the development of cloning. Some scientists now suggest that the cloning of humans could occur in the near future. Despite the benefits of cloning, however, certain ethical (道德的) questions concerning the possible abuse (滥用) of cloning have been raised. At the heart of these questions is the idea of humans influencing life in a way that could harm society, either morally or in a real physical sense. Some people object to cloning because it allows scientists to "act like God" in the handling of living organisms.
The cloning of Dolly raised the debate over this practice to a whole new level. It has become obvious that the technology for cloning Dolly could also be used to clone humans. A person could choose to make two or ten or a hundred copies of himself or herself by the same techniques used with Dolly. An active debate about the morality of cloning humans arises. Some people see benefits from the practice, such as providing a way for parents to produce a new child to replace one dying of a fatal disease. Other people worry about humans taking into their own hands the future of the human race.
At the beginning of the twenty-first century, many scientists say the controversy over the ethics of cloning humans is overstressed because of the unpredictability (不可预测性) of cloning in general. While scientists have cloned animals such as sheep, mice, cows, pigs, and goats, fewer than 3 percent of all those cloning efforts have succeeded. The animal clones that have been produced often have health problems. Scientists believe the rapid reprogramming in cloning can introduce random (任意的) errors into a clone’s DNA. Those errors have altered individual genes in minor ways, and the genetic defects (缺陷) have led to the development of major medical problems. Some scientists say this should make human cloning out of the question, but others argue that cloning humans may actually be easier and safer than cloning animals. Whatever, I agree that further research in the field of cloning is needed.
1.Some people are against cloning of humans because they think _________.
A．the practice takes too much time and money B．the cloning technology is still not mature C．humans control the future of the human race D．the population in the world will be too large
2.Some scientists think the debate over ethics of cloning humans is overstressed because ____.
A．cloning of human beings is completely impossible B．the result of cloning can’t be predicted in general C．cloning of animals is a failure D．there are big errors in a clone’s DNA
3.We can learn from the text that _______.
A．cloning of humans is a very controversial issue B．the cloning of Dolly begins to raise the debate over cloning of humans C．there are medical problems in cloning animals D．cloning humans is easier and safer than cloning animals
4.The text is mainly about _______.
A．the benefits of cloning B．the ethics of cloning C．the history of cloning D．the defects of cloning
高二英语阅读理解中等难度题查看答案及解析
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Recently there was a major discovery in the scientific research — the mapping of all DNA in a human gene（基因） is complete．Couple of years ago, this seems an impossible task for scientist to accomplish．All this progress in science leads us to believe that the day, when the human being will be cloned, is not far away．Human cloning has always been a topic of argument, in terms of morality（道德） or religion．
Taking a look at why cloning might be beneficial, among many cases, it is arguable that parents who are known to be at risk of passing a genetic limitation to a child could make use of cloning．If the clone was free of genetic limitations, then the other clone would be as well．The latter could be inserted in the woman and allowed to ripen to term．Moreover, cloning would enable women, who can’t get pregnant, to have children of their own．
Cloning humans would also mean that organs could be cloned, so it would be a source of perfect transfer organs．This surely would be greatly beneficial to millions of unfortunate people around the world that are expected to lose their lives due to failure of single （or more） organ（s）．It is also arguable that a ban on cloning may be unlawful and would rob people of the right to reproduce and limit the freedom of scientists．
Arguments against cloning are also on a perfectly practical side．Primarily, I believe that cloning would step in the normal “cycle” of life．There would be a large number of same genes, which reduce the chances of improvement, and, in turn, development — the fundamental reason how living things naturally adapt to the ever-changing environment．Life processes failing to do so might result in untimely disappearance．Furthermore, cloning would make the uniqueness that each one of us possesses disappear, thus leading to creation of genetically engineered groups of people for specific purposes, and chances are that those individuals would be regarded as “objects” rather than people in the society．
Scientists haven’t 100% guaranteed that the first cloned humans will be normal．Thus, this could result in introduction of additional limitations in the human “gene-pool”．
Regarding such arguable topics in “black or white” approach seems very innocent to me personally．We should rather try to look at all “shades” of it．I believe that cloning is only legal if its purpose is for cloning organs; not humans．Then we could regard this as for “saving life” instead of “creating life”．I believe cloning humans is morally and socially unacceptable．
1.Which of the following is true according to the passage?
A．Genetic limitations will be beneficial for some women．
B．A large number of genes will prevent us from developing．
C．First cloned humans might be normal according to scientists．
D．Forbidding cloning might limit the freedom of scientists．
2.What’s the author’s opinion on cloning?
A．It should be entirely banned．
B．It is acceptable if it is used for cloning organs．
C．It will take away the right to reproduce．
D．It should be used in creating life．
3.Where can you read this article?
A．In a story book． B．In a magazine．
C．In a science fiction． D．In a novel．
4.Which of the following shows the structure of the passage（1—6 refer to paragraph 1—6）?
A．
B．
C．
D．高三英语阅读理解困难题查看答案及解析
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Recently there was a major discovery in the scientific research — the mapping of all DNA in a human gene(基因) is complete. Couple of years ago, this seems an impossible task for scientist to accomplish. All this progress in science leads us to believe that the day, when the human being will be cloned, is not far away. Human cloning has always been a topic of argument, in terms of morality(道德) or religion.
Taking a look at why cloning might be beneficial, among many cases, it is arguable that parents who are known to be at risk of passing a genetic limitation to a child could make use of cloning. If the clone was free of genetic limitations, then the other clone would be as well. The latter could be inserted in the woman and allowed to ripen to term. Moreover, cloning would enable women, who can’t get pregnant, to have children of their own.
Cloning humans would also mean that organs could be cloned, so it would be a source of perfect transfer organs. This surely would be greatly beneficial to millions of unfortunate people around the world that are expected to lose their lives due to failure of single (or more) organ(s). It is also arguable that a ban on cloning may be unlawful and would rob people of the right to reproduce and limit the freedom of scientists.
Arguments against cloning are also on a perfectly practical side. Primarily, I believe that cloning would step in the normal “cycle” of life. There would be a large number of same genes, which reduce the chances of improvement, and, in turn, development — the fundamental reason how living things naturally adapt to the ever-changing environment. Life processes failing to do so might result in untimely disappearance. Furthermore, cloning would make the uniqueness that each one of us possesses disappear, thus leading to creation of genetically engineered groups of people for specific purposes, and chances are that those individuals would be regarded as “objects” rather than people in the society.
Scientists haven’t 100% guaranteed that the first cloned humans will be normal. Thus, this could result in introduction of additional limitations in the human “gene-pool”.
Regarding such arguable topics in “black or white” approach seems very innocent to me personally. We should rather try to look at all “shades” of it. I believe that cloning is only legal if its purpose is for cloning organs; not humans. Then we could regard this as for “saving life” instead of “creating life”. I believe cloning humans is morally and socially unacceptable.
1.Which of the following is true according to the passage?
A. Genetic limitations will be beneficial for some women.
B. A large number of genes will prevent us from developing.
C. First cloned humans might be normal according to scientists.
D. Forbidding cloning might limit the freedom of scientists.
2.What’s the author’s opinion on cloning?
A. It should be entirely banned. B. It is acceptable if it is used for cloning organs.
C. It will take away the right to reproduce. D. It should be used in creating life.
3.Where can you read this article?
A. In a story book. B. In a magazine.
C. In a science fiction. D. In a novel.
4.Which of the following shows the structure of the passage(1—6 refer to paragraph 1—6)?
高三英语阅读理解简单题查看答案及解析
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Recently there was a major discovery in the scientific research — the mapping of all DNA in a human gene(基因) is complete. Couple of years ago, this seems an impossible task for scientist to accomplish. All this progress in science leads us to believe that the day, when the human being will be cloned, is not far away. Human cloning has always been a topic of argument, in terms of morality(道德) or religion.
Taking a look at why cloning might be beneficial, among many cases, it is arguable that parents who are known to be at risk of passing a genetic limitation to a child could make use of cloning. If the clone was free of genetic limitations, then the other clone would be as well. The latter could be inserted in the woman and allowed to ripen to term. Moreover, cloning would enable women, who can’t get pregnant, to have children of their own.
Cloning humans would also mean that organs could be cloned, so it would be a source of perfect transfer organs. This surely would be greatly beneficial to millions of unfortunate people around the world that are expected to lose their lives due to failure of single (or more) organ(s). It is also arguable that a ban on cloning may be unlawful and would rob people of the right to reproduce and limit the freedom of scientists.
Arguments against cloning are also on a perfectly practical side. Primarily, I believe that cloning would step in the normal “cycle” of life. There would be a large number of same genes, which reduce the chances of improvement, and, in turn, development — the fundamental reason how living things naturally adapt to the ever-changing environment. Life processes failing to do so might result in untimely disappearance. Furthermore, cloning would make the uniqueness that each one of us possesses disappear, thus leading to creation of genetically engineered groups of people for specific purposes, and chances are that those individuals would be regarded as “objects” rather than people in the society.
Scientists haven’t 100% guaranteed that the first cloned humans will be normal. Thus, this could result in introduction of additional limitations in the human “gene-pool”.
Regarding such arguable topics in “black or white” approach seems very innocent to me personally. We should rather try to look at all “shades” of it. I believe that cloning is only legal if its purpose is for cloning organs; not humans. Then we could regard this as for “saving life” instead of “creating life”. I believe cloning humans is morally and socially unacceptable.
1. Which of the following is true according to the passage？
A. Genetic limitation will be beneficial for some women
B. A large number of genes will prevent us from developing
C. Prohibition(禁止) of cloning might limit the freedom of scientists
D. First cloned humans might be normal according to scientists
2.What’s the author’s opinion on cloning?
A. Cloning should be entirely banned
B. Cloning should be used in creating life
C. Cloning will take away the right to reproduce
D. Cloning is acceptable if it is used for cloning organs
3.Which of the following shows the structure of the passage
高二英语阅读理解中等难度题查看答案及解析
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Recently there was a major discovery in the scientific research—the mapping of all DNA in a human gene（基因）is complete. Couple of years ago, this seems an impossible task for scientist to accomplish. All this progress in science leads us to believe that the day, when the human being will be cloned, is not far away. Human cloning has always been a topic of argument，in terms of morality or religion.
Taking a look at why cloning might be beneficial, among many cases, it is arguable that parents who are known to be at risk of passing a genetic limitation to a child could make use of cloning. If the clone was free of genetic limitations. Then the other clone would be as well. The latter could foe inserted in the woman and allowed to ripen to term. Moreover，cloning would enable women, who can’t get pregnant, to have children of their own.
Cloning humans would also mean that organs could be cloned, so it would be a source of perfect transfer organs. This, surely would be greatly beneficial to millions of unfortunate people around the world that are expected to lose their lives due to failure of single(or more) organ(s）.It is also arguable that a ban on cloning may be unlawful and would rob people of the right to reproduce and limit the freedom of scientists.
Arguments against cloning are also on a perfectly practical side. Primarily, I believe that cloning would step in the normal “cycle”of life. There would be a large number of same genes., which reduce the chances of improvement，and, in turn, development-the fundamental reason how living things naturally adapt to the ever-changing environment. Life processes failing to do so might result in untimely disappearance. Furthermore, cloning would make the uniqueness that each one of us possesses disappea. Thus, leading to creation of genetically engineered groups of people for specific purposes and, chances are, that those individuals would be regarded as “objects” rather than people in the society.
Scientists haven’t 100 percent. guaranteed that the first cloned will be normal. Thus this could result in introduction of additional limitations in the human “gene-pool”.
Regarding such arguable topics in “black or white” approach seems very innocent to me personally. We should rather try to look at all “shades: of it. I believe that cloning is only legal if its purpose is for cloning organs, not humans. Then we could regard this as for “saving life” instead of “creating life”. I believe cloning humans is morally and socially unacceptable.
1.Which of the following is true according to the passage？
A. Genetic limitation will be beneficial for some women
B. A large number of genes will prevent us from developing
C. Prohibition of cloning might limit the freedom of scientists
D. First cloned humans might be normal according to scientists
2.What’s the author’s opinion on cloning?
A. Cloning should be entirely banned
B. Cloning should be used in creating life
C. Cloning will take away the right to reproduce
D. Cloning is acceptable if it is used for cloning organs
3.Where can you read this article?
A. In a story book. B. In a magazine. C. In a science fiction D. In a brochure
4. Which of the following shows the structure of the passage
高三英语阅读理解中等难度题查看答案及解析
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Recently there was a major discovery in the scientific research—the mapping of all DNA in a human gene is complete. Several years ago, it seems an impossible task for scientist to accomplish. All this progress in science leads us to believe that the day when human being will be cloned is not far away. Human cloning has always been a topic of argument in terms of morality (道德) or religion.
Taking a look at why cloning might be beneficial, among many cases, it is arguable that parents who are known to be at risk of passing a genetic limitation to a child could make use of cloning. Moreover, cloning would enable women who can't get pregnant to have children of their own.
Cloning humans would also mean that organs could be cloned, so it would be a source of perfect transfer organs. This surely would be greatly beneficial to millions of unfortunate people around the world who are expected to lose their lives due to organ problems. It is also arguable that a ban on cloning may be unlawful and would rob people of the right to reproduce and limit the freedom of scientists.
However, arguments against cloning are also on a perfectly practical side. Primarily, I believe that cloning would step in the normal "cycle" of life. There would be a large number of same genes, which reduce the chances of evolution, since it may be difficult for living creatures to naturally adapt to the ever-changing environment, which will result in ultimate disappearance. Furthermore, cloning would make the uniqueness that each one of us possesses disappear. Thus, leading to creation of genetically engineered groups of people for specific purposes and, chances are that those individuals would be regarded as "objects" rather than people in the society.
Scientists couldn't surely guarantee that the first cloned humans will be normal. Thus this could result in introduction of additional limitations in the human "gene-pool".
Regarding such arguable topics in "black or white" approach seems very innocent. We should try to look at all "shades" of it. I believe that cloning is only legal if its purpose is for cloning organs; not humans. Then we could regard this as for "saving life" instead of "creating life". It is believed that cloning humans is morally and socially unacceptable.
1.What's the author's opinion on cloning?
A.Cloning should be entirely banned.
B.Cloning should be used in creating life.
C.Cloning will take away the right to reproduce.
D.Cloning is acceptable if it is used for cloning organs.
2.Which of the following shows the structure of the passage?
A.
B.
C.
D.
3.Where is the text probably from?
A.A story book. B.A magazine.
C.A science fiction. D.A novel.
高二英语阅读理解中等难度题查看答案及解析
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Recently there was a major discovery in the scientific research—the mapping of all DNA in a human gene（基因） is complete．Couple of years ago, this seems an impossible task for scientist to accomplish．All this progress in science leads us to believe that the day, when the human being will be cloned, is not far away．Human cloning has always been a topic of argument, in terms of morality or religion．
Taking a look at why cloning might be beneficial, among many cases, it is arguable that parents who are known to be at risk of passing a genetic limitation to a child could make use of cloning．If the clone was free of genetic limitations．then the other clone would be as well．The latter could foe inserted in the woman and allowed to ripen to term．Moreover, cloning would enable women, who can't get pregnant, to have children of their own．
Cloning humans would also mean that organs could be cloned, so it would be a source of perfect transfer organs．This, surely would be greatly beneficial to millions of unfortunate people around the world that are expected to lose their lives due to failure of single （or more） organ （s）．It is also arguable that a ban on cloning may be unlawful and would rob people of the right to reproduce and limit the freedom of scientists．
Arguments against cloning are also on a perfectly practical side．Primarily, I believe that cloning would step in the normal "cycle" of life．There would be a large number of same genes, which reduce the chances of improvement, and, in turn, development—the fundamental reason how living things naturally adapt to the ever-changing environment．Life processes failing to do so might result in untimely disappearance．Furthermore, cloning would make the uniqueness that each one of us possesses disappear．Thus, leading to creation of genetically engineered groups of people for specific purposes and, chances are, that those individuals would be regarded as "objects" rather than people in the society．
Scientists haven't 100 per cent．guaranteed that the first cloned humans will be normal．Thus this could result in introduction of additional limitations in the human "gene-pool"．
Regarding such arguable topics in "black or white" approach seems very innocent to me personally．We should rather try to look at all "shades" of it．I believe that cloning is only legal if its purpose is for cloning organs; not humans．Then we could regard this as for "saving life" instead of "creating life"．I believe cloning humans is morally and socially unacceptable．
1.Which of the following is true according to the passage?
A．Genetic limitation will be beneficial for some women
B．A large number of genes will prevent us from developing
C．Prohibition of cloning might limit the freedom of scientists
D．First cloned humans might be normal according to scientists
2.What's the author's opinion on cloning?
A．Cloning should be entirely banned．
B．Cloning should be used in creating life．
C．Cloning will take away the right to reproduce．
D．Cloning is acceptable if it is used for cloning organs．
3.Where can you read this article?
A．In a story book
B．In a magazine
C．In a science fiction
D．In a brochure
4.Which of the following shows the structure of the passage?
高三英语阅读理解中等难度题查看答案及解析
A．
B．
C．
D．