A team of American scientists has found a tre...

A team of American scientists has found a treatment to protect humans from the deadly H5N1 flu virus, ________ brings great ________ to the world.

A. that; appearance      B. which; relief        C. which; advantage     D. that; profit

高二英语单项填空简单题查看答案及解析

In 2016, a team of Japanese scientists found bacteria capable of breaking down and “eating” one of the world’s most popular plastics-polyethylene terephthalate(PET). It was valued as a potential breakthrough at the time. But a new discovery came as a team of British scientists examined an enzyme(酶) produced by the Japanese bacteria to find out more about its structure. While operating the structure to better understand how it worked, they accidentally created the changed enzyme that’s even more efficient at breaking down plastic bottles.

The researchers are now working to further improve the enzyme so it can be used on an industrial scale. It’s possible that within the next few years there could be an industrially possible process for turning PET into other substances so it can be recycled.

The ability to scale up the process will be important. Plastic pollution is fast becoming one of the biggest environmental issues of our time. More than 1 million plastic bottles are bought around the world every minute. Most of these bottles are made from PET，which can take up to00 years to biodegrade(生物降解), and many are left in the oceans. Over half of global PET waste is not collected for recycling and only 7 percent of bottles are recycled into new bottles.

Some scientists say the breakthrough, though promising, is nowhere near enough to solve our pollution crisis. These enzymes are not abundantly present in nature. So you would need to produce the enzyme first, then add it to the PET plastic to degrade it.”This is likely to be a slow process. If you have gone through the trouble of collecting the PET waste, then there are clearly far better ways to recycle it or burn it for energy,” said Wim, head of the Industrial Biotechnology Center. He suggested the use of commercially available biodegradable bioplastics would still be a better bet.

1.What unexpected discovery did the British scientists make?

A. An effective way to deal with plastic waste.

B. A potential solution in collecting PET waste.

C. The way to understand the structure of enzyme better.

D. The real value of the discovery by Japanese scientists.

2.What does the underlined phrase “the process” in Paragraph 3 actually refer to?

A. The process to find the enzyme.

B. The process to make more plastics.

C. The process to reduce the PET waste.

D. The process to produce kind of new PET.

3.What is the problem about recycling the PET waste?

A. Large quantities of plastic bottles are used.

B. Ocean plastic waste is harder to biodegrade

C. Most of the PET waste is left without treatment.

D. Most of the plastic products are made from PET.

4.What can be concluded from the last paragraph?

A. The enzyme does not exist in nature.

B. The enzyme has helped to solve the plastic problems.

C. Burning plastic waste for energy is now the best way to rid it.

D. We have a long way to go to use the enzyme to recycle PET waste.

高二英语阅读理解中等难度题查看答案及解析

Through a series of experiments, an American scientist has gained an understanding of the social structure of ant societies. The ants 1. (examine) by scientists are the only creatures other than man to have given up hunting and collecting for a completely agricultural way of life. In their underground nests they plant gardens on soils made from finely cut leaves. This is a complex 2. (operate) requiring considerable division of labor. The workers of this type of ant can 3. (divide) into four groups according to size. 4. of the groups performs a particular set of jobs.

The making and care of the garden and the nursing of the young ants are done by the smallest workers. Slightly larger workers are responsible 5.cutting leaves to make them suitable for use in the gardens and for cleaning the nest. 6. third group of still larger ants do the construction work and collect fresh leaves from outside the nest. The 7. (large) are the soldier ants, whose duty is to defend the nest.

8. (find) out how good the various size groups are at different tasks, the scientist measured the amount of work done by the ants against the amount of energy they used. He examined first the gathering and carrying of leaves. He selected one of the size groups and then measured 9.efficiently these ants could find leaves and run back to the nest. Then he repeated the experiment for each of the other size groups. 10.this way he could see whether any group could do the job more efficiently than the group normally undertaking it.

高二英语短文填空中等难度题查看答案及解析

Mar Levine, ____ scientist at University of Pennsylvania, US, has found that competitive eaters have stomachs that can expand like ____ balloon.

高二英语单项填空中等难度题查看答案及解析

It is the prevention of disease ______its successful treatment that has led to the rapid increase of the world’s population.

A.rather than　 B.other than

C.more than　　　　 D.better than

高二英语单项填空中等难度题查看答案及解析

It is the prevention of disease ______its successful treatment that has led to the rapid increase of the world’s population.

A.rather than　　 B.other than　　　　

C.more than　　　 D.better than

高二英语单项填空中等难度题查看答案及解析

Recently some American scientists have given a useful piece of advice to people in industrialized countries.They say people should eat more of the same kind of food eaten by humans living more than 10,000 years ago.1.

The scientists say that human life has changed greatly. Our bodies have not been able to deal with these changes in lifestyle and this has led to new kinds of sicknesses.2.They are called“diseases of civilization”．Many cancers and diseases of the blood system are examples of such diseases.

The scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none.3.However, a change in food is one of the main differences between life in ancient times and that today.

Stone Age people hunted wild animals for their meat, which had much less fat than domestic (驯养的) ones. They ate a lot of fresh wild vegetables and fruits. They did not have milk or any other dairy products, and they made very little use of grains. 4. We eat six times more salt than our ancestors and we eat more sugar as well. We eat twice as much fat but only one third as much protein (蛋白质) and much less vitamin C.

5.But the scientists say that we would be much healthier if we eat much the same way the ancient people did, cutting the amount of fat, salty and sweet food.

A. Stone Age people lived a simple life without any meat.

B. But today, we enjoy eating a lot of these.

C. In that case, they would live a much healthier life.

D. Ancient people also got lots of physical exercise.

E. These new sicknesses were not known in ancient times.

F. People today probably don't want to live like our ancestors.

G. Modern people used to suffer from“diseases of civilization”．

高二英语阅读表达中等难度题查看答案及解析

Recently some American scientists have given a useful sincere piece of advice to people in industrialized nations that they would be much healthier if they ate more of the same kind of food eaten by humans living more than 10,000 years ago.

The scientists say that the human body has changed very little since humans first appeared on the earth, but the way we live has changed greatly. Our body has not been able to deal with these changes in life style and this has led to new kinds of sicknesses. These new sicknesses were not known in ancient times, so they are called “diseases of civilization”. Many cancers and diseases of the blood system, including heart attacks and strokes ( 中风 ) are examples of such diseases.

Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none. Ancient people also got a great deal of physical exercise, but a change in food is one of the main differences between life in ancient times and that of today.

Stone-age people hunted wild animals for their meat, which had much less fat than domestic or tame ones ( 家畜 ). They also ate a lot of fresh wild vegetables and fruits. They didn’t have milk or any other dairy products, and they made very little use of grains. But today, we eat a large amount of these. We eat six times more salt than our remote ancestors. We eat more sugar. We eat twice as much fat but only one third as much protein and much less vitamin C.

People today probably do not want to live the way people thousands of years ago did, but scientists say that we would be much healthier if we ate much the same way as remote ancestors did, cutting the amount of fatty, salty and sweet food.

1.What is the main cause that people suffer from a lot of new sicknesses?

A. Ancient people did a great deal of physical exercise.

B. People today have a lot of alcohol.

C. People today have more tobacco.

D. Food today is quite different from that of ancient times.

2.Which of the following belongs to the dairy products?

A. Milk              B. Corn     C. Pork             D. Flour

3. New kinds of sicknesses have been found because ________.

A. the human body has changed compared with humans who first appeared on the earth

B. the way we live has changed a little

C. our body can’t deal with the changes in life style

D. the way we live today is proper for the human body

4. According to some scientists, Stone-age people were much healthier than people today because they ate a lot of ________.

A. milk and other dairy products                         B. salt and sugar

C. wild animals, fresh wild vegetables and fruits     D. grain foods

高二英语阅读理解简单题查看答案及解析

Recently some American scientists have given a useful piece of advice to people in industrialized nations．They say people should eat more of the same kind of food eaten by humans living more than 10,000 years ago.　 1.

The scientists say that the human life has changed greatly．Our bodies have not been able to deal with these changes in lifestyle and this had led to new kinds of sicknesses. 2. So they are called "diseases of civilization"．Many cancers and diseases of the blood system are examples of such diseases.

Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none．3. However, a change in food is one of the main differences between life in ancient times and that of today.

Stone Age people hunted wild animals for their meat, which had much less fat than domestic ones．They ate a lot of fresh wild vegetables and fruits．They did not have milk or any other dairy products, and they made very little use of grains.　 4..We eat six times more salt than our ancestors．We eat more sugar．We eat twice as much fat but only one third as much protein and much less vitamin C.

5.　 But scientists say that we would be much healthier if we eat much the same way the ancient people did, cutting the amount of fatty, salty and sweet food.

A．Stone Age people lived a simple life.

B．But today, we enjoy having a lot of these.

C．In that case, they would live much healthier.

D．Ancient people also got lots of physical exercise.

E．These new sicknesses were not known in ancient times.

F．People today probably don't want to live like our ancestors.

G．Modern people used to suffer from "diseases of civilization".

高二英语阅读表达中等难度题查看答案及解析

Recently some American scientists have given a useful sincere piece of advice to people in industrialized nations that they would be much healthier if they ate more of the same kind of food eaten by humans living more than 10,000 years ago.

The scientists say that the human body has changed very little since humans first appeared on the earth, but the way we live has changed greatly. Our body has not been able to deal with these changes in life style and this has led to new kinds of sicknesses. These new sicknesses were not known in ancient times, so they are called “diseases of civilization”. Many cancers and diseases of the blood system, including heart attacks and strokes ( 中风 ) are examples of such diseases.

Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none. Ancient people also got a great deal of physical exercise, but a change in food is one of the main differences between life in ancient times and that of today.

Stone-age people hunted wild animals for their meat, which had much less fat than domestic or tame ones ( 家畜 ). They also ate a lot of fresh wild vegetables and fruits. They didn’t have milk or any other dairy products, and they made very little use of grains. But today, we eat a large amount of these. We eat six times more salt than our remote ancestors. We eat more sugar. We eat twice as much fat but only one third as much protein and much less vitamin C.

People today probably do not want to live the way people thousands of years ago did, but scientists say that we would be much healthier if we ate much the same way as remote ancestors did, cutting the amount of fatty, salty and sweet food.

1.What is the main cause that people suffer from a lot of new sicknesses?

A. Ancient people did a great deal of physical exercise.

B. People today have a lot of alcohol.

C. People today have more tobacco.

D. Food today is quite different from that of ancient times.

2.Which of the following belongs to the dairy products?

A. Milk               B. Corn     C. Pork             D. Flour

3.New kinds of sicknesses have been found because ________.

A. the human body has changed compared with humans who first appeared on the earth

B. the way we live has changed a little

C. our body can’t deal with the changes in life style

D. the way we live today is proper for the human body

4.According to some scientists, Stone-age people were much healthier than people today because they ate a lot of ________.

A. milk and other dairy products                         B. salt and sugar

C. wild animals, fresh wild vegetables and fruits     D. grain foods

高二英语阅读理解中等难度题查看答案及解析