Since the gene, called DAF-16 in worms, was f...

Since the gene , called DAF-16 in worms, was found in many animals and in humans, the finding could open up new ways to affect aging ,immunity and resistance in humans the scientists said.

“We wanted to find out how normal aging is being governed by genes and what effect these genes have on other traits such as immunity,”said Robin May , who led the study.

Populations across the world are aging at a surprising pace , bring potentially big challenges for health and social care systems . A study by Danish scientists last year found that half of babies born in rich world today will live to celebrate their 100^th birthday . Scientists are eager to find out how people age to try to develop drugs to help them stay healthier lives extend.

“What we have found is that things like resistance and aging tend go hand in hang “ May said in an interview

May’s team compared longevity ,stress resistance and immunity in four related species of worm. They also looked for differences in the activity of DAV-16 in each of the four species and found that they were all quite distinct.

May said DAF-16 was active in most cells in the body and was very similar to a group of human genes called FOXO genes , which scientists believe play a role in the aging process.  “The fact that subtle differences in DAF-16 between species seem to have such an impact on aging and health is very interesting and many explain how differences in lifespan and related traits have arisen during evolution，”May said

1.In which section may the text appear in a newspaper?

A  Education   B  Science   C  Entertainment    D  Culture

2. According to May ,________

A resistance has a lot of to do with aging    B FOXO genes can be found in worms

C genes play the same role in difference species   D  new drugs will change the genes in older people

3.From the text we know that DAF-16________

A is a gene that is only found in worms     B can make people live longer

C has an effect on aging and immunity     D  has been quite familiar to scientists

高二英语阅读理解简单题查看答案及解析

Since the gene, called DAF-16 in worms, was found in many animals and in humans, the finding could open up new ways to affect aging, immunity(免疫)and resistance in humans, the scientists said.

“We wanted to find out how normal aging is being governed by genes and what effect these genes have on other traits, such as immunity,” said Robin May of the University of Birmingham, who led the study.

Populations across the world are aging at a surprising pace, bringing potentially big challenges for health and social care systems. A study by Danish scientists last year found that half of babies born in the rich world today will live to celebrate their 100th birthdays. Scientists are eager to find out how people age to try to develop drugs to help them stay healthier as their lives extend.

“What we have found is that things like resistance and aging tend to go hand in hand,” May said in an interview.

May’s team compared longevity, stress resistance and immunity in four related species of worm. They also looked for differences in the activity of DAF-16 in each of the four species, and found that they were all quite distinct.

May said DAF-16 was active in most cells in the body and was very similar to a group of human genes called FOXO genes, which scientists believe play a role in the aging process.

“The fact that subtle（微妙的）differences in DAF-16 between species seem to have such an impact on aging and health is very interesting and may explain how differences in lifespan and related traits have arisen during evolution,” May said.

1.In which section may the text appear in a newspaper?

A. Education.              B. Science.          C. Entertainment.         D. Culture.

2.What can we know from the third paragraph?

A. New ways have been found to affect aging. B. Babies in the rich world will all live longer.

C. Present social care systems are poorly managed.

D. Aging populations are causing more challenges.

3.From the text we know that DAF-16._________

A. is a gene that is only found in worms    B. can make people live longer

C. has an effect on aging and immunity      D. has been quite familiar to scientists

4.What can be the best title of the passage?

A. Scientists Find Gene Linked to Aging  B. Population Aging Faster than Expected

C. How to Make People Live Longer     D. Gene Determines How Long We Live

高二英语阅读理解困难题查看答案及解析

Many experts are calling the growing problem of global waste a worldwide health crisis in since pollution from trash is not only harming the world’s oceans, air and soil but also endangering people’s health as well as the livelihood of all living creatures.

Reduce, reuse, recycle

Such a dilemma raises the question, is there a more responsible way of dealing with trash? Fortunately, there is. 1.One example of this is what’s often called the three Rs: reduce, reuse, recycle. Reducing the use of plastic containers as well as reusing and recycling bottles and cans decreases the amount of garbage being sent to landfills. As a result, less money is spent on waste management, and countries’ financial burdens are significantly relieved. Such positive effects on an economy are known as a circular economy.

Circular economy

Traditionally, manufacturers would make a product to be used and disposed of by consumers. This linear (直线型的) model of production offered no help in the fight against global waste. 2..

Once a product’s value is exhausted, the materials are recycled and returned to manufacturers. The outcome is less waste. One large-scale example of this is happening on the island of Taiwan.

3.

In 1997, Taiwan established its signature 4-in-1 Recycling Program, consisting of communities, government cleaning teams, recycling companies and the Recycling Fund. Residents separate their recyclable waste. The local government collection teams collect it.4.. Importers and manufacturers who are responsible for the recyclable products pay a fee into the Recycling Fund. The Recycling Fund is an essential aspect of the program used to subsidize (补贴) the recycling disposal system, support education and research and development as well as finance recycling efforts in the future.

Turning garbage into gold

By following a circular system, more products than ever are being manufactured using recycled materials. Environmentally-friendly decisions like these help to conserve natural resources, reduce pollution, save landfill space and even create new job opportunities. 5..

A.Practices in Taiwan

B.4-in-1 Recycling Program

C.Recycling can truly turn garbage into gold

D.Living a zero-waste lifestyle is the way to go

E.Alternatively, a circular economy was introduced

F.The recyclable waste is recycled in many local factories

G.Recycling companies buy waste materials from them to make profits

高二英语七选五中等难度题查看答案及解析

Since it was founded a year ago, the babysitting pool has become increasingly popular in the United States. More and more mothers have joined it and have benefited from it. What attracts them most is the idea that you pay your babysitter not in cash, but in paper cards. When you join the babysitting pool, you are given thirty cards, which are worth 30-minute babysitting time each. For each half an hour while you are gone, the babysitter gets paid one card.

There are rules regulating this service. You should not watch more than three kids at a time including your own. On big holidays, such as Christmas and Thanksgiving, the babysitter should be paid twice as much, which means two cards for every half an hour. When you leave the babysitting pool, you should return all the cards. If you are out of cards, you cannot use money instead. You should have to baby-sit for others to earn enough cards so that you will have them handy when you yourself need a babysitter.
　 Many mothers think highly of this service. It keeps children in constant touch with one another, and makes life easier for the mothers. Since in most cases, the babysitter is the mother who watches other kids at her own home, it is still possible for her to do her own things while the kids play with each other. In fact most mother babysitters find that their own kids are less of a monster and easier to watch when they are around other playmates. Moreover, since the babysitting pool service does not involve money, it will not be a financial loss to the family.

In the past year, the babysitting pool has helped so many mothers with their work that they all think that it is indeed a good community service worth keeping.

高二英语填空题中等难度题查看答案及解析

The big hospital, which___in 1936, has saved many lives.

高二英语单项填空简单题查看答案及解析

When I called at his home the other day, I found him sitting on an armchair, ___ in his hands.

A. buried his head　　 B. burying his head

C. his head burying　　 D. his head to be buried

高二英语单项填空中等难度题查看答案及解析

The reason_______ so many people rushed to California was ______ another gold mine was found in California.

A. that; because    B. why; that   C. that; why    D. why; because

高二英语单项填空中等难度题查看答案及解析

For many years it was common in the United States to associate Chinese Americans with restaurants and places that wash clothes. People did not realize that the Chinese had been driven into these occupations by the prejudice and discrimination that faced them in this country.

The first Chinese to reach the United States came during the California Gold Rush of 1849. Like most of the other people there，they had come to search for gold. In that largely unoccupied land， the men staked a claim (立界标表明所有权) for themselves by placing makers’ in the ground. However，either because the Chinese were so different from the others or because they worked so patiently that they sometimes succeeded in getting a mining claim to make a profit ( where others saw no way to do so) ,they became the target".Of their competi­tors. They were troubled and attacked in many ways. Often they were prevented from working their claims; some places even passed regulations forbidding them to own claims. The Chinese therefore started to seek out other ways of earning a living. Some of them began to wash clothes for the white miners; others set up small restaurants. (There were almost no women in California in those days and the Chinese filled a real need by doing this" women's work". ) Some went to work as farmhands or as fishermen.

In the early 1860's many more Chinese arrived in California. This time railroad companies brought the men in to build the first railroad line from California to the East. They were sorely needed because the work was so hard and dangerous，and it was carried on in such an isolated part of the country that the railroad company could not find other laborers for the job. As in the case of the first Chinese in America， these Chinese were almost all males; and like them，too，they encountered a great deal of prejudice. The hostility grew es­pecially strong after the railroad project was completed，and the Chinese laborers returned to California—thousands of them，all out of work

Many of today's Chinese Americans are the descendants of some of the early miners and railroad workers.

1. What is the main idea of the passage?

A. The first Chinese to reach the United States came during the California Gold Rush of 1849.

B. Many more Chinese arrived in California to construct the first railroad from California to the East.

C. Early Chinese immigrants to America experienced a lot of prejudice and discrimination.

D. Prejudice and discrimination that Chinese Americans met.

2. Why did the Chinese become the target of their competitors?

A. Because the Chinese were different and they worked patiently to achieve a lot of success while others couldn't.

B. The Chinese were so different from the others.

C. They worked so patiently with little payment

D. There were almost no women in California in those days.

3.What was the fate of the Chinese after the construction of the railroad?

A. They went back to their own country

B. They stayed to work in the railroad companies.

C. They went to California to search for gold.

D. The hostility grew especially strong.

4.What is the meaning of the word" encountered"?

A. face.            B. Count.         C. Enter.             D. Handle.

5.The following statements are true EXCEPT       .

A. during the California Gold Rush of 1849，people staked a claim for themselves by placing markers in the ground

B. the first Chinese went to America because they wanted to work as farmhands or as fishermen

C. many of today's Chinese Americans are the descendants of the early miners and railroad workers

D. the Chinese were sorely needed because the work was so dangerous

高二英语阅读理解中等难度题查看答案及解析

Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.

A. that; to eat　　　　 B. whether; to be eaten

C. whether; to eat　　 D. that; to be eaten

高二英语单项填空中等难度题查看答案及解析

Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.

A. that; to eat　　                 　　 B. whether; to be eaten　　　

C. that; to be eaten　　     D. whether; to eat

高二英语单项填空中等难度题查看答案及解析