If you could change your child's DNA in the f...

If you could change your child's DNA in the future to protect them against diseases, would you? It could be possible because of technology known as CRISPR- Cas, or just CRISPR.

CRISPR involves a piece of RNA, a chemical messenger, designed to work on one part of DNA； it also uses an enzyme (If) that can take unwanted genes out and put new ones in, according to The Economist. There are other ways of editing DNA, but CRISPR will do it very simply, quickly, and exactly.

The uses of CRISPR could mean that cures are developed for everything from Alzheimer's to cancer to HIV. By allowing doctors to put just the right cancer-killing genes into a patient's immune system, the technology could help greatly.

In April scientists in China said they had tried using CRISPR to edit the genomes (基因组)of human embryos. Though the embryos would never turn into humans, this was the first time anyone had ever tried to edit DNA from human beings. With this in mind, the US' National Academy of Sciences plans to discuss questions about CRISPR s ethics(伦理问题).For example? CRISPR doesn't work properly yet. As well as cutting the DNA it is looking for, it often cuts other DNA, too. In addition, we currently seem to have too little understanding of what DNA gives people what qualities.

There are also moral questions around playing God”. Of course, medicine already stops natural things from happening-for example, it saves people from infections. The opportunities to treat diseases make it hard to say we shouldn't keep going.

A harder question is whether it is ever right to edit human germ-line(种系)cells and make changes that are passed on to children. This is banned in 40 countries and restricted in many others. However, CRISPR means that if genes can be edited out, they can also be edited back in. It may be up to us as a society to decide when and where editing the genome is wrong.

Also, according to The Economist, gene editing may mean that parents make choices that are not obviously in the best interests of their children: “Deaf parents may prefer their children to be deaf too； parents might want to make their children more intelligent at all costs.

In the end, more research is still needed to see what we can and can't do with CRISPR. “It's still a huge mystery how we work,” Craig Mello? a UMass Medical School biologist and Nobel Prize winner, told The Boston Globe, "We're just trying to figure out this amazingly complicated thing we call life.

1.What is the passage mainly about?

A.What we can and can't do with CRISPR.

B.How CRISPR was developed by scientists.

C.The advantages of CRISPR and arguments about its ethics.

D.Scientists' experiments of using CRISPR to edit human embryos.

2.According to the passage, the technology of CRISPR .

A.is very safe because it only cuts the DNA it is looking for

B.is banned in most countries and restricted in many others

C.could cause parents to make unwise choices for their children

D.could help us discover the link between DNA and the qualities it gives people

3.It can be inferred from the passage that .

A.all diseases could probably be cured through the uses of CRISPR

B.scientists had never edited genomes before CRISPR was invented

C.CRISPR is a technology that uses an enzyme to work on RNA and DNA

D.CRISPR has proven to be the most effective way to protect children against diseases

4.What is the author's attitude towards CRISPR?

A.Supportive. B.Worried. C.Negative. D.Objective.

高三英语阅读理解困难题查看答案及解析

If you could change your child's DNA in the future to protect them against diseases, would you? It could be possible because of technology known as CRISPR- Cas, or just CRISPR.

CRISPR involves a piece of RNA, a chemical messenger, designed to work on one part of DNA; it also uses an enzyme that can take unwanted genes out and put new ones in, according to The Economist. There are other ways of editing DNA, but CRISPR will do it very simply, quickly, and exactly.

The uses of CRISPR could mean that cures are developed for everything from Alzheimer's to cancer to HIV. By allowing doctors to put just the right cancer-killing genes into a patient's immune system, the technology could help greatly.

The US' National Academy of Sciences plans to discuss questions about CRISPR s ethics(伦理问题). For example, CRISPR doesn't work properly yet. As well as cutting the DNA it is looking for, it often cuts other DNA, too. In addition, we currently seem to have too little understanding of what DNA gives people what qualities.

There are also moral questions around playing God. Of course, medicine already stops natural things from happening-for example, it saves people from infections. The opportunities to treat diseases make it hard to say we shouldn't keep going.

Also, according to The Economist, gene editing may mean that parents make choices that are not obviously in the best interests of their children: “Deaf parents may prefer their children to be deaf too; parents might want to make their children more intelligent at all costs.”

In the end, more research is still needed to see what we can and can't do with CRISPR. “It's still a huge mystery how we work,” Craig Mello, a UMass Medical School biologist and Nobel Prize winner, told The Boston Globe, “We're just trying to figure out this amazingly complicated thing we call life.”

1.What is the passage mainly about?

A.What we can and can't do with CRISPR.

B.The advantages of CRISPR and arguments about its ethics.

C.How CRISPR was developed by scientists.

D.Scientists' experiments of using CRISPR to edit human embryos.

2.What does the writer mean by saying “playing God” in Para. 5?

A.Playing jokes on religious people.

B.Asking God to help deal with moral questions.

C.Following the instructions of God.

D.Doing things that go against nature.

3.According to the passage, the technology of CRISPR　　　　　　　 .

A.is very safe because it only cuts the DNA it is looking for

B.is very helpful to cure people of any disease

C.could cause parents to make unwise choices for their children

D.could help us understand how complicated life is

4.What is the author's attitude towards CRISPR?

A.Objective. B.Worried.

C.Negative. D.Supportive.

高三英语阅读理解中等难度题查看答案及解析

If you want to improve your child’s results at school, you could do a lot worse than ensuring that they do plenty of exercise. Scientists have already shown that physical activity can make you brainier. But a team in America has used scans to show that an important part of the brain actually grows in children who are fit. These youngsters tend to be more intelligent and have better memories than those who are inactive.

　Scientists also found that one of the most important parts of their brains was 12 percent larger than those of unfit children. They believe that encouraging children to take exercise from a very young age could help them do better at school later. Researchers from the University of Illinois, in the U.S., studied the brains of 49 children aged nine and ten using a magnetic resonance imaging scan (核磁共振摄影扫描), a technique which provides very detailed pictures of organs and tissues in the body.

　They also tested the fitness levels of the children by making them run on a treadmill (跑步机). The scientists found that the hippocampus, a part of the brain responsible for memory and learning, was around 12 percent larger in the fitter children.

　Professor Art Kramer, who led the study published in the journal Brain Research, said the findings had important implications for encouraging individuals to take part in sport from a young age. “We knew that experience and environmental factors and socioeconomic status all impact brain development,” he said. “If you get some terrible genes from your parents, you can’t really fix that, and it’s not easy to do something about your economic status. But here’s something that we can do something about.”

1. If you want to improve your children’s result in school, ____________.

A. it is worse to ensure that they do plenty of exercise

B. you can have their brain scanned

C. it could be better to make sure that they do a lot of exercise

D. you can do a lot except ensuring that they do exercise

2. According to the passage, which of the following statements is NOT true?

A. The fitness level of the children is linked to their intelligence.

B. Children who have a larger hippocampus will probably have better memories.

C. You can do something about the genes from your parents.

D. Unhealthy children will probably have a smaller hippocampus than others.

3.All the following factors that have some influence on one’s brain are mentioned EXCEPT ____________.

A. genetic factor    B. economic status   C. physical fitness  D. economic development

高三英语阅读理解中等难度题查看答案及解析

If you want to improve your child’s results at school, you could do a lot worse than ensuring that they do plenty of exercise. Scientists have already shown that physical activity can make you brainier. But a team in America has used scans to show that an important part of the brain actually grows in children who are fit. These youngsters tend to be more intelligent and have better memories than those who are inactive.

　Scientists also found that one of the most important parts of their brains was 12 percent larger than those of unfit children. They believe that encouraging children to take exercise from a very young age could help them do better at school later. Researchers from the University of Illinois, in the U.S., studied the brains of 49 children aged nine and ten using a magnetic resonance imaging scan (核磁共振摄影扫描), a technique which provides very detailed pictures of organs and tissues in the body.

　They also tested the fitness levels of the children by making them run on a treadmill (跑步机). The scientists found that the hippocampus, a part of the brain responsible for memory and learning, was around 12 percent larger in the fitter children.

　Professor Art Kramer, who led the study published in the journal Brain Research, said the findings had important implications for encouraging individuals to take part in sport from a young age. “We knew that experience and environmental factors and socioeconomic status all impact brain development,” he said. “If you get some terrible genes from your parents, you can’t really fix that, and it’s not easy to do something about your economic status. But here’s something that we can do something about.”

1.If you want to improve your children’s result in school, ____________.

A. it is worse to ensure that they do plenty of exercise

B. you can have their brain scanned

C. it could be better to make sure that they do a lot of exercise

D. you can do a lot except ensuring that they do exercise

2.According to the passage, which of the following statements is NOT true?

A. The fitness level of the children is linked to their intelligence.

B. Children who have a larger hippocampus will probably have better memories.

C. You can do something about the genes from your parents.

D. Unhealthy children will probably have a smaller hippocampus than others.

3. All the following factors that have some influence on one’s brain are mentioned EXCEPT ____________.

A. genetic factor    B. economic status   C. physical fitness  D. economic development

高三英语阅读理解中等难度题查看答案及解析

语法填空

If you want to be successful in changing your habits, you should think about changing your inner beliefs about your habits. For example, your old belief was: “I love cigarette because　 1.　 makes me feel good and 2.　　　 (relax). I need cigarette to be happy and relaxed.” If you keep this belief, you won’t be able to keep your resolution 3.　　　 (stop) smoking for very long. Instead, you should adopt this new belief: “I love yoga because it makes me feel good and relaxed. Cigarette is toxic 4.　　 destroys my body. Yoga makes me happy.” You should analyze your beliefs and make sure they won’t stop you 5.　　　　 changing your habits. The 6.　 is true when you try to form positive habits. If you want to start eating healthy food, here are some positive beliefs you should start thinking about: “Healthy food is very good for my health. It gives me a lot of energy and I feel very good.”

Everybody can change. All it takes is courage and 7.　　 (commit). Decide right now!　 Improve your life by 8.______ (change) your habits. Take action right now! Don’t be afraid. Yes, you will9.______ (probable) make mistakes along the way. But never forget success is guaranteed for you if you have positive habits in your life. If you refuse to quit, success 10. (be) yours.

高三英语语法填空中等难度题查看答案及解析

I would appreciate ______ very much if you could change the plan a bit to make it more workable.

A．that              B．this              C．it                D．you

高三英语单项填空中等难度题查看答案及解析

I would appreciate ______ very much if you could change the plan a bit to make it more workable.

A．that              B．this              C．it                D．you

高三英语单项填空中等难度题查看答案及解析

Five steps to take if your child is being bullied

 51  The worst thing you can do is ignore it. Too often parents feel children and teens need to “work things out” on their own. If the problem is ignored, your child’s self-esteem will become unhealthy, he will be hurt mentally or physically, and he could become a bully himself.

Here are five steps you can take if your child is having problems with a bully:

52  This is an important first step and will help your child trust that you are able to help him with his problem. Accept what he has to say at face value by using your active listening skills.

Let your child know that he is not alone. 53  Reassure your child that he is not the problem. Nothing he did caused the bully to go after him.

If your child is being threatened in a physical or illegal way at school, report the problem. Your child may not want you to do this, or the school may not take it seriously, but violence cannot be tolerated. 54  You will need to model assertive (果断的) behavior by alerting those in charge where the bullying is taking place.

Teach your child assertive behavior and how to ignore routine teasing. Let them know it is okay to say “No.” sometimes even friends bully, so letting your child know they can be true to their own feelings and say “No” can go a long way.

55 Giving up possessions or giving in to a bully in anyway encourages the bully to continue. Identify ways for your child to respond to a bully---showing assertive but not aggressive behavior---and role-play them.

A. Believe what your child tells you.

B. Encourage your child not to give in to a bully.

C. Praise your child for being brave enough to talk about it.

D. Bullying is a terrible situation for a child to have to cope with.

E. If you choose not to do anything, that is what you’re teaching your child.

F. Most children have to deal with some type of bullying behavior at one time or another.

G. If your child comes to you because a bully is bothering him, you need to pay close attention to the problem.

高三英语信息配对中等难度题查看答案及解析

iPad vs textbooks

What if you could have your whole backpack at the touch of your fingertips? In the first month of the Apple iPads release, 25million were sold! People all over the world use iPads for all sorts of different things, but one of their finest qualities is the ability to be a textbook. __1.____

To begin with, iPad are less expensive. Textbooks become outdated and schools have to buy new books, but with an iPad schools can update them for free. _2.___ Schools don’t have to spend $500 every year for iPads because they last a while and can be updated.

___3.__ Students usually have multiple classes, which results in multiple textbooks. Heavy backpacks filled with books can cause back problem. A solution to that is an iPad, which only weighs 1.33 pounds and can hold all of a student’s textbooks.

Thirdly, schools should get rid of their textbooks and get iPads because they have more capabilities. Some might think all of the apps are distracting, but the apps actually make iPads more efficient. 4.　　　 _ Textbooks cannot do those tasks, but iPads can easily do them with just a tap of the fingertip.

Lastly, iPads are a better choice for schools instead of textbooks because these devices allow students to access their learning anywhere at any time. _5.__ With iPads, they find it easier to get their homework done.

In conclusion, schools should get rid of their clumsy textbooks and switch to iPads. iPads have allowed this generation to have their entire backpack in the palm of their hands.

A. These tablets are perfect for busy students.

B. Secondly, iPads cost less and are more popular.

C. Therefore, they can use the saved money for other programs.

D. iPads have already replaced textbooks in over 600 American counties.

E. Moreover, in high school, textbooks have an average of 4.8 pounds each.

F. Schools have every reason to do away with their school books and switch to iPads.

G. iPads absorb the need to buy calculators, dictionaries, and other items that are found within the device.

高三英语七选五中等难度题查看答案及解析

DNA left at a crime scene could be used in the future to build up a picture of an offender’s face, it was revealed tonight.

A first step towards genetic mugshots has been taken by researchers in the US who link specific DNA markers with face shape. To identify the genes, they focused on known mutations(突变) that cause changes of the face and head. Normal versions of these genes were found to influence individual features. For instance, one gene affected the lips, another the shape and configuration of bones around the eyes, and a third the appearance of the mid-face and skull. In total, 20 genes had “significant effects” on facial appearance.

Lead scientist Professor Mark Shriver, from Pennsylvania State University, said: “We use DNA to match to an individual or identify an individual, but you can get so much more from DNA. Currently we can’t go from DNA to a face, or from a face to DNA, but it should be possible.” The implications are far reaching, raising the possibility of creating a data bank of facial types based on genetic markers. DNA from a crime scene could then be used to produce a rough image of the face of an offender or victim. Such genetic mugshots may be more reliable than computer-generated “e-fits” based on witnesses’ recollections. Other uses of the technique might include proving the identity of fathers in paternity cases, or visualising our remote ancestors from fossil DNA.

The scientists wrote in the online journal Public Library of Science Genetics: “Such predictive modelling could be forensically useful; for example, DNA left at crime scenes could be tested and faces predicted in order to help to narrow the pool of potential suspects. Further, our methods could be used to predict the facial features of descendants, deceased ancestors, and even extinct human species. In addition, these methods could prove to be useful diagnostic tools.” The team developed a model which first established a range of physical face shapes from people of mixed West African and European ancestry from the US, Brazil and Cape Verde. Measurements were taken of thousands of point co-ordinates on grids placed over 3D images of the faces.

Statistical methods were then used to determine the relationship between facial differences and the effects of gender, ethnic ancestry and individual gene variants.

1.The underlined word “mugshots” in the second paragraph most probably means _________.

A. different faces        B. characteristics    C. pictures of faces     D. genders

2.What can be inferred from the passage?

A. DNA has been used to build up a picture of an offender’s face.

B. It may be much easier to catch criminals with the help of DNA.

C. In all, 20 genes had “significant effects” on facial appearance.

D. One gene can affect more than one part of your face.

3.According to Professor Mark Shriver, we know_________.

A. they can merely match to an individual or identify an individual

B. there is a possibility of going from DNA to a face

C. DNA could be used to produce a rough image of an offender’s face

D. this technology is more reliable than computer-generated “e-fits”

4.What is the most possible title of the passage?

A. Creating a data bank of DNA

B. Recognizing the DNA of criminals

C. Predicting the location of offence using DNA

D. Building image of offender’s face from DNA

高三英语阅读理解中等难度题查看答案及解析