题目列表(包括答案和解析)
It’s difficult for doctors to help a person with a hurt brain. 36 enough blood, the brain can live only three to five minutes. Usually doctors can’t fix the hurt 37 such a short time.
Dr Robert White thinks he knows a 38 of help. He thinks doctors should make the hurt brain 39 to live for 30 minutes without blood. This gives the doctor 40 time to do something for the brain. Dr White experimented his 41 on fifteen monkeys. 42 he taught them to do different jobs. Then he operated on them. He made the monkeys’ blood go 43 a machine. When the brains’ 44 was 10℃, he stopped the blood to the brain. After 30 minutes, he turned the blood back on. He 45 the blood again. After their operations, the monkeys were almost 46 before. They were healthy and busy. Each one could still do the job the doctor 47 them.
Dr White’s idea works well on monkeys. He thinks it will work on 48 . He think it will help with heart problems. A person 49 die when his heart stops; doctors can 50 it again. The problem comes: when the brain is without blood for about 5 minutes, it 51 . If doctors start the heart again after 5 minutes, the person has 52 body but a dead brain. Maybe in the future, doctors will 53 Dr White’s idea. When the person’s heart stops the doctor will 54 cool the brain. They will have 30 minutes to start the heart again. Maybe there will be no 55 the brain.
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Research advances over the past decade have told us that, with a little work, we humans can clone just about anything we want, from frogs to monkeys and probably even ourselves!
So, we can clone things, but why would we want to?
Of all the reasons, cloning for medical purposes has the most potential to benefit large numbers of people. How might cloning be used in medicine?
1. Cloning animal models of disease
Much of what researchers learn about human disease comes from studying animal models such as mice. Often, animal models are genetically engineered to carry disease-causing mutations(变异) in their genes. Creating these transgenic（转基因的） animals is a time-intensive process that requires trial-and-error and several generations of breeding（培育）. Cloning technologies might reduce the time needed to make a transgenic animal model, and the result would be a population of genetically identical animals for study.
2．Cloning stem cells(干细胞) for the treatment of diseases
Stem cells are the body's building blocks, responsible for developing and repairing the body throughout life. As a result, they might be used to repair damaged or diseased organs and tissues. Researchers are currently looking up cloning as a way to create certain human stem cells for the research of diseases.
3. Cloning farm animals for drug production
Farm animals such as cows, sheep and goats are currently being genetically engineered to produce drugs or proteins that are useful in medicine. Just like creating animal models of disease, cloning might be a faster way to produce large herds of genetically engineered animals.
1.From Purpose One, we can infer that .
A．most transgenic animals are clone
B．most animals carry engineered genes
C．most transgenic animal models are not cloned
D．most animals carry disease-causing mutations in their genes
2.It can be learned from Purpose Two that cloning technologies can be mainly use do .
A．create damaged or diseased organs and tissues
B．clone genetically defined human stem cells
C．develop and maintain the body
D．repair the body throughout life
3.According to Purpose Three, cloning technologies can be mainly used to .
A．speed up the producing of genetically engineered animals
B．produce drugs or proteins that are useful in medicine
C．raise genetically engineered cows, sheep and goats
D．produce large herds of animals for human beings
Ⅲ 阅读(共两节，满分40分)
第一节 阅读理解(共15小题；每小题2分，满分30分)
阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
Is a mouse that can speak acceptable? How about a dog with human hands or feet? Scientists, the people with the know-how to make such things happen, are now thinking about whether such experiments are morally right or not.
On Nov. 10, Britain’s Academy of Medical Sciences launched a study on the use of animals with human materials in scientific research. The work is expected to take at least a year, but its leaders hope it will lead to guidelines for scientists in Britain and around the world on how far they can go mixing human genes into animals in search of ways to fight human diseases.
“Do these constructs (构想) challenge our idea of what it is to be human?” asked Martin Bobrow, a professor of medical genetics at Cambridge University and chair of a 14-member group looking into the issue. “It is important that we consider these questions now so that appropriate boundaries are recognized.”
Using human material in animals is not new. Scientists have already created monkeys that have a human form of the Huntingdon’s gene so they can study how the disease develops; and mice with livers (肝) made from human cells are being used to study the effects of new drugs.
However, scientists say the technology to put ever greater amounts of human genetic material into animals is spreading quickly around the world --- raising the possibility that some scientists in some places may want to go further than is morally acceptable.
Last year in Britain there was a lively debate over new laws allowing the creation of human-animal embryos (胚胎) for experiments. On one side of the debate were religious groups, who claimed that such science interferes with nature. Opposing them were scientists who pointed out that such experiments were vital to research cures for diseases.
The experts will publish reports after the end of the study, in which they will give definitions (定义) for animal embryos with human genes or cells, look at safety and animal welfare issues, and consider the right legal framework to work within.
1. What does the underlined word “they” in Paragraph 2 refer to?
A. Scientists in Britain and around the world. B. Leaders of the research.
C. Guidelines for scientists. D. Scientific experiments.
2. Scientists do research of mixing human genes into animals in order to ____.
A. test new drugs on animals B. to find ways to fight human diseases
C. prove the research is morally acceptable
D. create monkeys and mice with livers made from human cells
3. We can infer from the passage that ____.
A. the experts will release reports after the study
B. scientists have never doubted the use of animals with human materials
C. the creation of human-animal embryos for experiments is legal in Britain
D. religious groups hold that cures for diseases have to be done through experiments
4. What would be the best title of the passage?
A. Morally right or not? B. A debate about new laws
C. Cures for diseases D. Animal embryos with human genes
5. Where is the passage from?
A. A science textbook B. A science booklet
C. the science column of a newspaper D. A science magazine for teenagers
It is difficult for doctors to help a person with a damaged brain. Without enough blood, the brain lives for only three to five minutes. More often the doctors can’t fix the damage. Sometimes they are afraid to try something to help because it is dangerous to work on the brain. The doctors might make the person worse if he operates on the brain.
Dr. Robert White, a famous professor and doctor, thinks he knows a way to help. He thinks doctors should make the brain very cold. If it is very cold, the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.
Dr. White tried his idea on 13 monkeys. First he taught them to do different jobs, then he operated on them. He made the monkeys’ blood back to the monkeys’ brains. When the brain’s temperature was 10℃, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.
1. The biggest difficulty in operating on the damaged brain is that .
A. the time is too short for doctors B. the patients are often too nervous
C. the damage is extremely hard to fix D. the blood-cooling machine might break down
2.The brain operation was made possible mainly by .
A. taking the blood out of the brain B. trying the operation on monkeys first
C. having the blood go through a machine D. lowering the brain’s temperature
3. With Dr. White’s new idea, the operation on the damaged brain .
A. can last as long as 30 minutes B. can keep the brain’s blood warm
C. can keep the patient’s brain healthy D. can help monkeys do different jobs
4. What is the right order of the steps in the operations?
a. send the cooled back to the brain b. stop the blood to the brain
c. have the blood cooled down d. operate on the brain
A. a, b, c, d B. c, a, b, d C. c, b, d, a D. b, c, d, a
5.Which of the following is not true?
A. If there isn’t enough blood, the brain can live for only three to five minutes.
B. If the brain is very cold, it can live without blood for half an hour.
C. Dr. White tried his idea for thirteen times.
D. After their operations, the monkeys were healthy and busy again.
Sure, human dads can play games with their kids and help with homework, but can they give birth? Daddy sea horses can! This Father’s Day, while you’re praising your daddy, you may also remember that some of the best dads in the world can be found in the animal kingdom:
Sea horses: The “Mr. Moms” in the sea, male sea horses, carry up to 2,000 fertilized eggs in small bags in their stomachs until they hatch. Even after the babies are born, they stay inside the bag until they are ready to live by themselves.
Darwin’s rheas: Thought your dad was overprotective? Darwin’s rheas, also known as South American ostriches (鸵鸟), are so protective of their children that they have even been known to attack small airplanes on the ground if they get too close to their home!
Marmosets: These little monkeys do everything but give lectures on how to give birth! Devoted dads assist during their babies’ birth. They also let Mom get some rest by taking care of the kids when she’s not nursing them.
Sand grouse: These pigeon-like birds live in areas where water is rare, so fathers fly as many as 50 miles to get water for their kids. After they dip their breast feathers in the water, they fly home and let their chicks suck the water from their bodies.
Fathers in the animal kingdom are not that different from our own beloved dads. This Father’s Day, when you are honoring your dad, honor animal dads, too, by practicing kindness toward all animals.
1. The underlined “they” in paragraph 2 refers to .
A. fertilized eggs B. their stomachs C. male sea horses D. baby sea horses
2. According to the passage, which animal is the most protective?
A. A sea horse B. A Darwin’s rhea C. A marmoset D. A san grouse
3.The passage mainly tells readers .
A. how clever and brave animals are
B. how to honor animal dads on Father’s Day
C. animal dads are different from human dads
D. some interesting facts about male animals
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