Experiments under way in several labs aim to create beneficial types of genetically modified foods, including starchier potatoes and caffeine-free coffee beans. Genetic engineers are even trying to transfer genes from a cold-winter fish to make a frost-resistant tomato.
A low-sugar GM strawberry now in the works might one day allow people with health problems such as diabetes (糖尿病) to enjoy the little delicious red fruits again. GM beans and grains rich in protein(蛋白质) might help people at risk of developing kwashiorkor. Kwashiorkor, a disease caused by severe lack of protein, is common in parts of the world where there are severe food shortages.
Commenting on GM foods, Jonathon Jones, a British researcher, said: "The future benefits will be enormous（巨大的）, and the best is yet to come". To some people, GM foods are no different from unmodified foods. "A tomato is a tomato," said Brian Sansoni, an American food manufacturer.
Critics of GM foods challenge Sansoni's opinion. They worry about the harm that GM crops might do to people, other animals, and plants.
In a recent lab study conducted at Cornell University, scientists tested pollen(花粉) made by BT corn, which makes up one-fourth of the U.S. corn crop. The scientist dropped the pollen onto milkweed, a plant that is the only known food source of a butterfly caterpillar(毛虫). Within four days of feeding on the leaves, almost half of a test group of caterpillars died. "This is a warning bell." said Cornell researcher Linda Raynor.
Some insects that are not killed by GM foods might find themselves made stronger. How so? The insecticides are used on the crops to kill the pests. But GM plants produce a continuous level of insecticide. Insects relying on those crops may develop resistance to the plants and they may also develop a resistance to the insecticide.
At the forum on GM food held last year in Canada. GM crops that have been made resistant to the herbicide might crossbreed with wild plants, creating "superweeds" that could take over whole fields.
So where do you stand? Should GM food be banned in the United States, as they are in parts of Europe? Or do their benefits outweigh（胜过） any of the risks they might carry?
1. The first three paragraphs try to give the idea that__________
A. GM foods may bring about great benefits to humans.
B. GM foods are no different from ordinary ones.
C. GM foods may have both benefits and harm.
D. GM foods are particularly good to the kwashiorkor patients.
2. Why is the pollen-sprayed milkweed mentioned in Paragraph 5?
A. To show GM foods can kill insects effectively.
B. To show GM foods contain more protein.
C. To show GM foods also have a dark side.
D. To show GM foods may harm crops.
3. What happens to those insects when not killed by the spray of insecticide?
A. They may lose their ability to produce lay eggs.
B. They may have a higher ability to adapt to the environment.
C. They move to other fields free from insecticide.
D. They never eat again those plants containing insecticide.
4. Which of the following statements concerning banning GM foods is true according to the passage?
A. Underdeveloped countries have banned GM foods.
B. Both Europe and the U.S. have banned GM foods.
C. Most European countries have not banned GM foods.
D. The United States has not banned GM foods.
高二英语阅读理解中等难度题
Experiments under way in several labs aim to create beneficial types of genetically modified foods, including starchier potatoes and caffeine-free coffee beans. Genetic engineers are even trying to transfer genes from a cold-winter fish to make a frost-resistant tomato.
A low-sugar GM strawberry now in the works might one day allow people with health problems such as diabetes (糖尿病) to enjoy the little delicious red fruits again. GM beans and grains rich in protein(蛋白质) might help people at risk of developing kwashiorkor. Kwashiorkor, a disease caused by severe lack of protein, is common in parts of the world where there are severe food shortages.
Commenting on GM foods, Jonathon Jones, a British researcher, said: "The future benefits will be enormous（巨大的）, and the best is yet to come". To some people, GM foods are no different from unmodified foods. "A tomato is a tomato," said Brian Sansoni, an American food manufacturer.
Critics of GM foods challenge Sansoni's opinion. They worry about the harm that GM crops might do to people, other animals, and plants.
In a recent lab study conducted at Cornell University, scientists tested pollen(花粉) made by BT corn, which makes up one-fourth of the U.S. corn crop. The scientist dropped the pollen onto milkweed, a plant that is the only known food source of a butterfly caterpillar(毛虫). Within four days of feeding on the leaves, almost half of a test group of caterpillars died. "This is a warning bell." said Cornell researcher Linda Raynor.
Some insects that are not killed by GM foods might find themselves made stronger. How so? The insecticides are used on the crops to kill the pests. But GM plants produce a continuous level of insecticide. Insects relying on those crops may develop resistance to the plants and they may also develop a resistance to the insecticide.
At the forum on GM food held last year in Canada. GM crops that have been made resistant to the herbicide might crossbreed with wild plants, creating "superweeds" that could take over whole fields.
So where do you stand? Should GM food be banned in the United States, as they are in parts of Europe? Or do their benefits outweigh（胜过） any of the risks they might carry?
1. The first three paragraphs try to give the idea that__________
A. GM foods may bring about great benefits to humans.
B. GM foods are no different from ordinary ones.
C. GM foods may have both benefits and harm.
D. GM foods are particularly good to the kwashiorkor patients.
2. Why is the pollen-sprayed milkweed mentioned in Paragraph 5?
A. To show GM foods can kill insects effectively.
B. To show GM foods contain more protein.
C. To show GM foods also have a dark side.
D. To show GM foods may harm crops.
3. What happens to those insects when not killed by the spray of insecticide?
A. They may lose their ability to produce lay eggs.
B. They may have a higher ability to adapt to the environment.
C. They move to other fields free from insecticide.
D. They never eat again those plants containing insecticide.
4. Which of the following statements concerning banning GM foods is true according to the passage?
A. Underdeveloped countries have banned GM foods.
B. Both Europe and the U.S. have banned GM foods.
C. Most European countries have not banned GM foods.
D. The United States has not banned GM foods.
高二英语阅读理解中等难度题查看答案及解析
For some in China, the aim of travel is to create 15-second videos on a social-media app, dou yin. As a matter of fact, tourism is for recreation and leisure. The world Tourism Organization defines tourists as people who travel to and stay in places outside their usual environment for more than twenty-four hours.Nowadays, apart from the traditional forms , a variety of new types of traveling are emerging.
Experiential travel
Last year's travel trend was "experiential travel". This is where tourists look for ways to get to know local culture and interact with local people so they feel less like an outsider but more like a resident.
Transformative travel
It usually goes through three stages – you go to a place that has a very different background than where you come from, you learn wisdom from the new culture and the people you meet, and finally you return home and apply the knowledge to your own life and the lives of those around you.
This last stage is how the “transformation” is completed and what separates transformative travel from experiential travel.
Eco-friendly travel
One way to plan a low-impact trip is to travel a shorter distance, which can reduce your carbon footprint. "One trans-Atlantic flight equals a year's worth of driving, so consider planning an adventure closer to home," according to US News.
Dark travel
Chernobyl is one of the most popular examples of the phenomenon known as dark tourism — a term for visiting sites associated with death and suffering, such as Nazi concentration camps in Europe or the 9/11 Memorial and Museum in New York.
1.In which column can we read this passage in the newspaper?
A.Advertising B.News C.Sports. D.Entertainment
2.Choosing the Transformative travel, you can__________
A.feel less like a local resident B.reduce carbon emission
C.put what you have learned into practice D.pay a visit to the sites related to sufferings .
3.Which of the following is suitable for the environmentalists?
A.Experiential travel B.Transformative travel
C.Eco-friendly travel D.Dark travel
高二英语阅读理解中等难度题查看答案及解析
Ways to create calm in your daily life
Most of us need some space for calm in our lives. A few simple minutes can create much needed moments of calm. 1.You can use these small skills to create calm in your busy schedule.
Go walking. Walking is perfect and you can do it well anywhere. Simply walking and taking in the view is stress reducing. 2. . It makes room for new ideas to develop.
Appreciate nature. when we think of nature we think of getting into the countryside or forests, and that is great if you can. 3. Actually, nature is everywhere. Find a park or a small patch(小块地)of green, or just stick your head out of the window! You have many ways to appreciate nature.
Listen to music. Many people listen to music to calm themselves down. Music actually lifts us out of ourselves. It can also draw our attention from boring and tiring things. 4..
5. . Certain activities like yoga and tai chi need quiet focus. They are perfect for active calming. They are good for the body, mind and spirit.
Try out some of these ways and you’ll soon be practicing “moments of calm”.
A. Do some activities.
B. But what if you are in the city?
C. Notice the animals around you.
D. It is a time to get stressful thoughts out of your head.
E. Music is a way to express the way that they are feeling.
F. With enjoyable music even work can be “music to your ear”.
G. You don’t have to find a mountain to sit on, or empty your mind of all thoughts for hours.
高二英语七选五困难题查看答案及解析
According to sociologists, there are several different ways in which a person may become recognized as a leader of a social group.
In the family, traditional cultural patterns award_________ to one or both of the parents. In other _______, such as friendship groups, one or more persons may gradually emerge as leaders, although there is no formal process of _______.In larger groups, leaders are usually chosen formally through election or recruitment.
Although leaders are often thought to be people with unusual personal ability, decades of research have failed to produce consistent _______ that there is any category of "natural leaders". It seems that there is no set of personal qualities that all leaders have _______; rather, practically any person may be recognized as a leader if the person has _______ that meet the needs of that particular group.
Research suggests that there are typically two different leadership _______ that are held by different individuals. Instrumental leadership is leadership that emphasizes the _______ of tasks by a social group. Group members look to instrumental leaders to "get things done". Expressive leadership, on the other hand, is leadership that emphasizes the _______well-beings of a social group's members. Expressive leaders are less concerned with the overall goals of the group than with providing ____________ support to group members and attempting to decrease tension and conflict among them. Instrumental leaders are likely to have a rather secondary relationship to other group members. They give others and may ____________ group members who restrict attainment of the group's goals. Expressive leaders cultivate a more ____________ or primary relationship to others in the group.They offer ____________ when someone experiences difficulties and try to____________ issues that threaten to divide the group. As the difference in these two roles suggest, expressive leaders generally receive more personal ______________ from group members; instrumental leaders, if they are successful in promoting group goals, may enjoy a more distant respect.
1.A.burden B.leadership C.housework D.right
2.A.families B.societies C.cases D.researches
3.A.selection B.struggle C.recommendation D.register
4.A.evidence B.support C.approach D.pattern
5.A.in advance B.in brief C.in general D.in common
6.A.partners B.achievements C.skills D.qualities
7.A.selections B.roles C.challenges D.structures
8.A.assignment B.introduction C.completion D.division
9.A.joint B.financial C.social D.individual
10.A.political B.administrative C.emotional D.technical
11.A.discipline B.praise C.ignore D.identify
12.A.casual B.temporary C.personal D.stable
13.A.criticism B.sympathy C.estimate D.information
14.A.omit B.confuse C.raise D.resolve
15.A.imitation B.affection C.objection D.revenge
高二英语完形填空困难题查看答案及解析
Having a pet dog at home can be beneficial in many ways. It can teach you the value of responsibility, companionship, and caring for something other than yourself. Owning a pet dog is not just a temporary thing. 1. You should care for your pet dog properly so you do not neglect it and help your parents train the pet dog so it is well behaved. You should also make sure you deal with any issues your pet dog is having responsibly so you do not harm your pet dog in any way.
2. You should start by providing the necessities for your pet dog, including food and fresh water. Your parents may already have a feeding schedule set up, with set times in the day for feeding your pet dog. You should follow this feeding schedule and ask your parents if you can help it with giving your pet dog food and water on a daily basis.
Clean up after the pet dog. You can also be a good pet owner by making sure you clean up after your dog. This means picking up any food that falls out of its food bowl and wiping up any water around its water dish so its feeding area is clean. 3.
Take your pet dog for daily walks. 4. You should create a walking schedule with your parents and assist your parents in walking your pet dog. You may put the collar or harness on the dog and take a tarn holding the leash during the walk, with the supervision of a parent.
Play with your pet dog. You should spend at least ten to fifteen minutes a day playing with your pet dog so that it feels loved and acknowledged by you. 5.
A. Give food and water to the pet dog.
B. Train your pet dog with simple orders.
C. It is a permanent responsibility that you must care for on a daily basis.
D. Never ever try playing jokes on your pet dog, because it will get hurt easily.
E. You should also use encouraging words and reward it with a treat if it behaves well when playing
F. You can also pick up any pet toys and put them in one area so that they are not scattered all over house.
G. You may have a pet dog that is medium to large in size, you will need to walk it on a daily basis.
高二英语七选五中等难度题查看答案及解析
Some Western countries have long ________ that Iran aims to create a nuclear bomb, but Teheran said the materials were only for civil use.
A.suspected B.doubted C.wondered D.convinced
高二英语单项填空中等难度题查看答案及解析
Are you sometimes stressed? Singing is a simple and effective way to reduce stress. It is beneficial mainly in the following three aspects.
Physical Benefits
1. This is especially recommended for the elders and those who have some form of disability in their voice. However, it is important to find a capable instructor to employ good singing techniques so as not to further damage vocal cords (声带) or lungs.
Singing also helps to improve your posture (姿势). Most people think that singing begins and ends with their mouth. 2. Singing practice will get you used to the proper body position of standing and help you form the good habit of standing straight.
Emotional Benefits
Singing helps in reducing your depression and lowering your stress level. When you sing, your body releases chemicals that make you feel happy, easing the tension and helping you to relax. 3.
Social Benefits
The social benefits of singing are huge. 4. So people who suffer from stage fright are advised to sing in front of family and friends before a live performance.
Singing is also very good for improving your communication skills. It is said that singing to babies helps to prepare their brains for language and may lessen the risk of language problems later in life. 5. The time spent in group singing, whether in a choir or at karaoke, creates a deep and lasting bond of friendship.
A. Try to regain your memory by singing.
B. First, it can help build up your confidence greatly.
C. When you sing, you can give your lungs a workout.
D Singing helps you to strengthen your immune system.
E. For adults, singing also enlarges your circle of friends.
F. In fact, the position of each body part affects your voice.
G. So, start to sing your favorite song next time you are feeling upset.
高二英语七选五中等难度题查看答案及解析
短文改错
As we all know , walking is an useful way of exercising and is beneficial to our health. It can not only reduce the risk of many kinds of diseases but also builds up the bones. It’s safe than many other ways of exercising, especially for the elderly and it’s easy to do without consider rules. Beside, walking can also help us lose weight.
What should we pay attention during the walk? First, we should wear loose clothes or good shoes so that we can relax. Second, we should walk fast enough to cause us to breath with difficulty but still be able to talk. Third, that is very important to walk with our arms moving freely. Most important, we should do it every day.
高二英语短文改错简单题查看答案及解析
Scientists _______ a lot of experiments on animals, hoping to find and effective way to cure the patients who had AIDS.
| A．carried on | B．carried out | C．carried away | D．carried off |
高二英语单项填空中等难度题查看答案及解析
It is widely believed among bioengineers _____ it will be possible to create life under laboratory conditions．
A．which B．what C．that D．when
高二英语单项填空中等难度题查看答案及解析