So far the majority of cloned animals have suffered from some different serious disorders, ______ died soon after birth.
A. many of which B. many of whom C. many of them D. many of that
高二英语单项填空中等难度题
So far the majority of cloned animals have suffered from some different serious disorders, ______ died soon after birth.
A. many of which B. many of whom C. many of them D. many of that
高二英语单项填空中等难度题查看答案及解析
So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.
A. many of which B. many of whom C. many of that D. many of them
高二英语单项填空中等难度题查看答案及解析
So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.
A．many of which B．many of whom C．many of them D．many of that
高二英语单项填空困难题查看答案及解析
So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.
A. many of which B. many of whom C. many of them D. many of that
高二英语单项填空中等难度题查看答案及解析
Heart disease is one of the major killers in the world today. Many who suffer from it must have heart transplants. However, it’s difficult to get a suitable heart donation, and even if a patient survives the wait, his or her body often rejects the heart.
But there is now new hope for sufferers of heart disease. According to a study published in the journal Advanced Science, researchers from Israel’s Tel Aviv University printed a 3D human heart on April 15.
“This is the first time anyone anywhere has successfully engineered and printed an entire heart,” professor Tal Dvir told CNN. Unlike the previous 3D-printed heart structure, the new heart is complete with cells, blood vessels, chambers and other structures a heart needs to function normally. But scientists still have more to figure out before the 3D-printed heart can be fitted into the body. For one thing, the experimental heart is only the size of a thumb. And, although it can contract like a muscle, it cannot pump out blood like a real one. At present, the heart prototype is like a tiny airplane that has all of the right parts, but can’t fly.
However, the development is still regarded as a major breakthrough in medicine.
In the experiment, the researchers turned human fat tissue into human heart tissue with stem cell technology. The tissue was then turned into “bio-ink” for a 3D printer to ensure that tissue in the heart came from the patients themselves. So ideally, if it were to be placed in the body of someone in need of a transplant, there would be less risk of organ rejection. “Patients will no longer have to wait for transplants or take medications to prevent their rejection,” researchers told USA Today. “Instead, the needed heart will be printed, fully personalized for every patient.”
But the scientists think that 3D printing can be used to create other human organs. They foresee a time when the 3D printing of organs will be an everyday medical practice. “Maybe, in 10 years, there will be organ printers in the finest hospitals around the world and these procedures will be conducted routinely,” Dvir said.
1.Why do scientists have to do further research before fitting the 3D-printed heart into the body?
A.Because the heart is incomplete.
B.Because the heart can’t pump out blood.
C.Because the heart is an airplane that can’t fly.
D.Because the heart can’t contract like a muscle.
2.What can we infer from the last two paragraphs?
A.The needed heart will be printed to meet every patient’s need.
B.The 3D printing of organs will be an unusual medical practice.
C.Dvir has a negative attitude towards the future of organ printers.
D.Patients will need medicines to stop their rejection for their heart transplant.
3.What can serve as the best title for the passage?
A.Organ printers in the hospitals.
B.How to get a suitable heart donation.
C.Heart disease: one of the major killers.
D.A 3D-printed heart: new hope for heart disease sufferers.
高二英语阅读理解简单题查看答案及解析
As we all know, ____________ cloning is the creation of cells or the whole animals using DNA from ____________ single “parent”.
A. the; a B. a; a
C. /; a D. /; the
高二英语单项填空中等难度题查看答案及解析
Almost 80% of the Americans have stated their opposition to cloning pet animals such as cats and dogs, yet companies still try to make a business out of selling cloned pets. Pet cloning has been promoted as a way to “bring back” or “copy” a beloved companion animal. However, studies have shown that cloning remains an experimental technology with many failures.
Behind each lovely picture of a cloned cat or dog lie hundreds of animals that were kept in lab cages, receiving bad treatment to produce just that one cloned animal. For all that, you end up with a cloned animal who is unlikely to appear like the original physically or behaviorally and may experience serious health problems. Also, while pet cloning companies are charging customers up to $150,000 for a cloned pet, millions of homeless animals of the same species are available in US animal shelters for around $100. Unfortunately, most of these animals are killed for lack of adopting homes.
With No Pet Cloning campaign, the American Anti-Vivisection Society (AAVS) tries to protect both animals and people from harm. They campaigned until the US companies that sold cloned animals closed their doors. First it was Genetic Savings & Clone Inc. and then it was BioArts International.
When BioArts was closed, its owner, Lou Hawthorne, finally had to acknowledge the problems of pet cloning. According to Hawthorne, he has seen numerous failures during his pet cloning attempts, “One clone----which was supposed to be black and white----was born greenish-yellow where it should have been white (we still have no good explanation for how that happened).”
The AAVS is educating the public about the animal suffering and is seeking regulation of cloning activities. They will continue to take the lead in protecting animals from the threats of pet cloning.
1.From the passage, we know that ____.
A. pets are often deserted by their owners
B. more and more people have joined the AAVS
C. most American are against cloning pet animals
D. the American Anti-Vivisection Society is supported by the government
2.According to the passage, companies keep on selling cloned pets to ____.
A. carry on scientific studies
B. get economic interests
C. protect pet animals
D. comfort animal lovers
3.What does the author try to do by writing the second paragraph?
A. To tell the truth behind pet cloning.
B. To show the method of pet cloning.
C. To compare pet animals with homeless ones.
D. To save the animals kept in labs and shelters.
4.The underlined word “acknowledge” probably means ____.
A. accept B. study C. admit D. manage
5.According to the passage, the AAVS devotes itself to ____.
A. getting most countries to fight against pet cloning
B. improving the technology of pet cloning
C. saving lots of animals from bad situations
D. stopping US companies’ selling cloned animals
高二英语阅读理解中等难度题查看答案及解析
Up to 90% of school leavers in major Asian cities are suffering from myopia ---short-sightedness, a study suggests. Researchers say the "extraordinary rise" in the problem is being caused by students working very hard in school and missing out on outdoor light.
Eye experts say that you are short-sighted if your vision is blurred(模糊的) beyond 2m. It is often caused by an elongation（拉伸） of the eyeball that happens when people are young. According to the research, the problem is being caused by a combination of factors - a commitment to education and lack of outdoor light.
Professor Morgan who led this study argues that many children in South East Asia spend long hours studying at school and doing their homework. This in itself puts pressure on the eyes, but exposure to between two and three hours of daylight helps maintain healthy eyes.
Cultural factors also seem to play a part. Across many parts of South East Asia, children often have a lunchtime nap. According to Professor Morgan they are missing out on natural light to prevent short-sightedness.
A big concern is the numbers of the students suffering from “high” myopia. One in five of these students could experience severe visual impairment(障碍) and even blindness. These people are at considerable risk—sometimes people are not told about it and are just given more powerful glasses—they need to be warned about the risk and given some self-testing measures so they can get to an ophthalmologist and get some help.
For decades, researchers believed there was a strong genetic component to the condition. But this study strongly suggests an alternative view. “Any type of simple genetic explanation just doesn’t fit with that speed of change; gene pools just don’t change in two generations. Whether it’s a purely environmental effect or an environmental effect playing a sensitive genome, it really doesn’t matter, the thing that’s changed is not the gene pool---it’s the environment.”
1.As is mentioned above, which factor mainly results in students’ myopia in South East Asia?
A．Genetic faults of the people. B．Elongation of the eyeball.
C．The shortage of outdoor light. D．Lack of research into the problem.
2.Which of the following statements do you think agrees with Professor Morgan?
A．A lunchtime nap is helpful in reducing myopia.
B．Glasses keep myopia from getting even worse.
C．It’s necessary to treat myopia with an operation.
D．It’s of vital importance to reduce educational pressure.
3.What’s the main idea of the last paragraph?
A．Gene remains the main cause of the long-standing problem.
B．The environment is to blame for the extraordinary rise in myopia.
C．Short-sightedness has nothing to do with changes in gene pools.
D．An environmental effect playing a sensitive genome counts.
4.What’s the best way to take care of your eyes according to the passage?
A．Equip the classroom with better lights.
B．Look at the sun from time to time.
C．Do eyes exercise regularly.
D．Spend more time in the open air.
高二英语阅读理解中等难度题查看答案及解析
The majority of the people, _________, are against human cloning.
A. including some scientists
B. some scientists included
C. included some scientists
D. Both A and B
高二英语单项填空中等难度题查看答案及解析
The Food and Drug Administration is, again, threatening to impose(征税) milk and meat from cloned animals on a public that opposes the technology and its products.
Respected polls report that more than 60% of Americans think animal cloning is immoral, and that most people said they wouldn’t knowingly eat the products even if the FDA approved them. But because the FDA would allow cloned meat and milk to be sold without identifying labels, consumers wouldn’t be able to avoid them. The FDA has consistently tilted toward those who want cloned milk and meat in our food. Agency officials have repeatedly asserted that science shows cloned milk and meat are safe for humans. But the FDA has never published the complete scientific studies it says support that claim.
The argument that cloning is safe for animals is unconvincing. Cloned meat and milk offer no public economic benefits. Having cloned cows produce more milk wouldn’t reduce milk prices. US farmers produce more milk than we drink, and the government is required to buy the surplus. Since 2000, dairy support programs have cost taxpayers more than $ 5 billion.
Most important, this first decision to advance animal biotechnology raises ethical issues beyond the FDA’s expertise（专家意见）. Techniques used to clone animals will advance the ability to clone humans－and create animals with human genes. Neither the agency nor animal scientists are qualified to tell us whether and when it is ethically acceptable for humans to alter the essential nature of animals. We need a national discussion, including ethicists and religious leaders, to consider the wisdom of cloned and transgenic animals. Given the risk of unintended consequences, we should proceed cautiously. The president should halt further FDA action on cloning and set in motion(运作) a process for beginning this broader discussion.
1. The author’s attitude towards cloning is __________.
A. standing in the middle B. opposed C. approving D. supportive
3. In US many people buy cloned foods __________.
A. to support the new technique
B. because FDA approved them
C. because they cannot tell which is cloned food
D. because they cannot read the labels.
3. From the text we know that cloning technique ___________.
A. developed well enough to clone human beings
B. may cause unintended bad results to human beings
C. will bring more unexpected economic benefits
D. is supported by ethicists and religious leaders
4. What’s the best title of this passage?
A．Public Is Against Cloned Food B．Benefits of Cloned Food
C．Cloned Food Is Illegal D．Technique in Cloned Food
高二英语阅读理解简单题查看答案及解析