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[主观题]

Across the United States, scientists are mounting what may become the most innovative agri

cultural research drive since the 1920's, when hybrid corn was developed. Surprisingly, the new genetic revolution is not taking place in America's fields. Instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes of crop plants. This genetic engineering may prove the biggest boon to agriculture since plant breeding began.

The new concepts grew out of the bioengineering of bacteria for the production of such things as human hormones and vaccines for viral diseases. Plant cells, however, are far more complex than bacteria, and it will probably take many years for today's encouraging laboratory results to have a major impact on the farm. In fact the payoff may not come until the next century.

But although bio-technologists are still in the earliest phases of this new field of science, they are already actively exploring ways to redesign plants so they will use sunlight mere efficiently, resist viruses and other pests, grow in hot or dry areas, in saline soils or in the presence of pesticides, and perhaps even make their own fertilizer out of nitrogen in the air. In addition, scientists have had early success in making wholly new plants that are unavailable by conventional plant breeding-a potato-tomato combination, for example.

The new technology holds the promise of virtually limitless horizons in food production. Only imagination sets the limits: frost-resistant wheat, tropical potatoes, saltwater rice, a plant producing a combination of a pea and a carrot-all may be with us one day.

Vaccines for viral diseases are often produced from ______.

A．plant cells

B．human hormones

C．crop plants

D．bacteria

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发布时间：2022-03-14

更多“Across the United States, scientists are mounting what may become the most innovative agri”相关的问题

第1题

Much of a parent's job is to provide the gifts of caring, love, and emotional support to c

hildren. But one gift is often beyond their reach: the resources to meet the financial demands of college tuition.

For more than 54 years, the United Negro College Fund has fulfilled the dreams of deserving students by closing the gap between the cost of college and what their parents can afford. More than 300,000 students have graduated from United Negro College Fund member colleges since 1944, and 54,000 more are currently enrolled.

The oldest and most successful minority higher education support organization, the United Negro College Fund, is a combination of 39 private, historically black member colleges and universities. Since its founding, it has raised more than $1.3 billion to keep the dream alive for needy families across the country.

What is it that makes the United Negro College Fund so important to America's families ？ As well as raising funds and giving technical support to member colleges and universities, it creates hope and opportunity by providing financial assistance to deserving students. Consider the contributions of just a few of the distinguished graduates who have realized the benefits: civil rights activist Dr. Martin Luther King; Olympic track star Edwin Moses; and filmmaker Spike Lee.

Most of parents fell embarrassed when their children graduate from high school because they can't ______.

A．afford their children's college tuition

B．offer their children emotional support

C．look after their children

D．give them gifts on their birthdays

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第2题

Much of a parent's job is to provide the gifts of caring, love, and emotional support to c

hildren. But one gift is often beyond their reach: the resources to meet the financial demands of college tuition.

For more than 54 years, the United Negro College Fund has fulfilled the dreams of deserving students by closing the gap between the cost of college and what their parents can afford. More than 300,000 students have graduated from United Negro College Fund member colleges since 1944, and 54,000 more axe currently enrolled (入学).

The oldest and most successful minority higher education support organization, the United Negro College Fund is a combination of 39 private, historically black member colleges and universities. Since its founding, it has raised more than $1.3 billion to keep the dream alive for needy families across the country.

What is it that makes the United Negro College Fund so important to America's families？ As well as raising funds and giving technical support to member colleges and universities, it creates hope and opportunity by providing financial assistance to deserving students. Consider the contributions of just a few of the distinguished graduates who have realized the benefits: civil rights activist Dr. Martin Luther King, Jr.; opera diva Leontyne Price; Olympic track star Edwin Moses; and filmmaker Spike Lee.

Most parents feel embarrassed when their children graduate from high school because they can't ______.

A．afford their children's college tuition

B．offer their children emotional support

C．look after their children

D．give them gifts on their birthdays

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第3题

In the 1940s, urban Americans began a mass move to the suburbs in search of fresh air, elb

ow room and privacy. Suburbs began to sprawl out across the countryside, since most of those making the move were middleclass, they took with them the tax money the cities needed to maintain the neighborhood, in which they had lived. The people left in the cities were often those who were too old or too poor to move. Thus many cities began to fall into disrepair. Crime began to soar, and public transportation was neglected. (In the past sixty years, San Francisco is the only city in the United States to have completed a new mass transit system.) Meanwhile, housing construction costs continued to rise higher and higher. Middle-class housing was allowed to decay, and little new housing was constructed.

Eventually, many downtown areas existed for business only. During the day they would be filled with people working in the offices and at night they would be deserted. Given these circumstances, some business executives began asking, "Why bother with going downtown at all？ Why not move the offices to the suburbs go that we can live and work in the same area？" Gradually some of the larger companies began to move out of the cities, with the result that urban centers declined even further and the suburbs expanded still more. This movement of business to the suburbs is not confined to the United States. Businesses have also been moving to the suburbs in Stockholm, Sweden, in Bonn, Germany, and in Brussels, Belgium as well.

What did the city lose when those people moved out to the suburbs？

A．Houses

B．Cars.

C．Jobs.

D．Tax money.

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第4题

［A］ For example, the Moche lords of Sipán in coastal Peru were buried in about AD

400 in fine cotton dress and with exquisite ornaments of bead, gold, and silver. Few burials rival their lavish sepulchres. Being able to trace the development of such rituals over thousands of years has added to our understanding of the development of human intellect and spirit.

［B］ By 40,000 years ago people could be found hunting and gathering food across most of the regions of Africa. Populations in different regions employed various technological developments in adapting to their different environments and climates.

［C］ Archaeological studies have also provided much information about the people who first arrived in the Americas over 12,000 years ago.

［D］ The first fossil records of vascular plants—that is, land plants with tissue that carries food—appeared in the Silurian period. They were simple plants that had not developed separate stems and leaves.

［E］ Laetoli even reveals footprints of humans from 3.6 million years ago. Some sites also contain evidence of the earliest use of simple tools. Archaeologists have also recorded how primitive forms of humans spread out of Africa into Asia about 1.8 million years ago, then into Europe about 900,000 years ago.

［F］ One research project involves the study of garbage in present-day cities across the United States. This garbage is the modern equivalent of the remains found in the archaeological record. In the future, archaeologists will continue to move into new realms of study.

［G］ Other sites that represent great human achievement are as varied as the cliff dwellings of the ancient Anasazi (a group of early Native Americans of North America) at Mesa Verde, Colorado; the Inca city of Machu Picchu high in the Andes Mountains of Peru; and the mysterious, massive stone portrait heads of remote Easter Island in the Pacific.

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第5题

American Blacks experienced a revolution after 1945, a revolution in expectations. Followi

ng World War Ⅱ, the steady movement toward first-class citizenship for Black people quickened, with significant actions taking place in courts of law, in voting booths, in restaurants and in the streets of the nation.

A decade of intense civil rights activity was launched in 1954 when the United States Supreme Court declared segregated schools to be unconstitutional. In 1955, Dr. Martin Luther King, Jr. , effectively organized the Blacks of Atlanta, Georgia, in a bus boycott. The boycott lasted two years, and when it was over, Blacks no longer were degraded by being forced to sit or stand in the rear of buses.

In 1960, a group of Black college students decided that they, sis well as white persons, had the right to eat at a lunch counter in Greensboro, North Carolina. This sit-in sparked an aggressive national movement and, in the next few years, thousands of young men and women -- Black and white, North and South -- overturned local laws and customs that had maintained segregation. Sit-ins, prayins, freedom rides, freedom marches and demonstrations to open all schools to Black children took place across the nation.

Several important actions took place to change the status of black people ______.

A．after World War Ⅱ

B．in 1954

C．before 1945

D．in 1960

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第6题

In 1917, Russia was in chaos. The economy was collapsing, there were food shortages and th

e country was suffering heavy losses in the World War I. Inevitably, people began to lose faith in their ruler, Tsar Nicholas II. On 15 March 1917, after much political unrest, the Tsar decided to abdicate. He was replaced by a new government led by Alexander Kerensky.

To begin with a rival political group, the Bolsheviks, led by Vladimir Lennin and Leon Trotsky, supported the new government, but their relationship soon collapsed. The Bolsheviks wanted even more change—their aim was to replace the existing political structure with groups representing each sector of society and they urged every worker to join a revolution in order to bring this about. In July 1917, the Bolsheviks tried to overthrow the government but failed. They tried again on 24 October and this time they were successful. The provisional government was arrested in St Petersburg, and Lenin took over as Head of State. Support for the Bolsheviks soon spread across Russia, and world's first “workers’ revolutionary State” became reality.

From the passage we may know that the situation in Russia in 1917 was______.

A．favorable

B．in disorder

C．inspiring

D．encouraging

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第7题

A century ago, the immigrants from across the Atlantic inclued settlers and sojourners. Along with the many folks looking to make a permanent home in the United States came those who had no intention

Today, we are much more rigid about immigrants. We divide nemcomers into two categories: legal or illegal, good or bad. We hail them as Americans in the making, or our broken immigrantion system and the long political paralysis over how to fix it. We don’t need more categories, but we need to change the way we think about categories. We need to look beyond strick definitions of legal and illegal. To start, we can recognize the new birds of passage, those living and thriving in the gray areas. We might then begin to solve our immigration challenges.

Crop pickers, violinists, construction workers, entrepreneurs, engineers, home health-care aides and physicists are among today’s birds of passage. They are energetic participants in a global economy driven by the flow of work, money and ideas .They prefer to come and go as opportunity calls them , They can manage to have a job in one place and a family in another.

With or without permission, they straddle laws, jurisdictions and identities with ease. We need them to imagine the United States as a place where they can be productive for a while without committing themselves to staying forever. We need them to feel that home can be both here and there and that they can belong to two nations honorably.

Accommodating this new world of people in motion will require new attitudes on both sides of the immigration battle .Looking beyond the culture war logic of right or wrong means opening up the middle ground and understanding that managing immigration today requires multiple paths and multiple outcomes. Including some that are not easy to accomplish legally in the existing system.

“Birds of passage” refers to those who____ .

A.immigrate across the Atlantic.

B.leave their home countries for good.

C.stay in a foreign temporialy.

D.find permanent jobs overseas.

It is implied in paragraph 2 that the current immigration system in the US____ .A.needs new immigrant categories.

B.has loosened control over immigrants.

C.should be adopted to meet challenges.

D.has been fixed via political means.

According to the author, today’s birds of passage want___ .A.financial incentives.

B.a global recognition.

C.opportunities to get regular jobs.

D.the freedom to stay and leave.

The author suggests that the birds of passage today should be treated ____ .A.as faithful partners.

B.with economic favors.

C.with regal tolerance.

D.as mighty rivals.

Select the title that is most suitable for the articleA.come and go: big mistake.

B.living and thriving : great risk.

C.with or without : great risk.

D.legal or illegal: big mistake.

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第8题

Football is the most popular sport in the fall in the United States. The game originated a

s a(an)【21】sport more than seventy-five years ago. It is still played by almost every college and university in the country, and the football stadiums of some of the largest universities【22】as many as 80,000 people. The game is not the same as European football. There are eleven players in each team, and【23】in padded uniforms because the game is rough and injuries are likely to occur. The【24】of the game is to carry or throw from one person to another the ball across the opponent's goal, or scoring line. He【25】has not attended a large college football game has missed one of the most colorful aspects of American college life.【26】the two halves of the game, the playing field if taken over by the bands (乐队) of the rival institutions,【27】take turns doing intricate marches and executing interesting formations. The student spectators are led in cheering for their team by trained, uniformed student cheerleaders,【28】are pretty girls. Outstanding high school football players are usually encouraged to come to a college and university【29】offers of scholarships and free room and board. Football is so popular and the urge to win is so keen, that many colleges actively【30】outstanding players for their student body. Attendance at football games is so large that it is not unheard of for a college or university to finance its entire athletic program from ticket sales.

(36)

A．outdoor

B．worldwide

C．college

D．unpopular

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第9题

In the United States, older people rarely live with their adult children. But in many othe

r cultures children are expected to care 【C1】______ their aged parents. In some parts of Italy, the percentage of adult children who 【C2】______ with their parents 【C3】______ 65 to 70 percent. In Thailand, too, children are expected to care for their elderly parents; few Thai elderly live 【C4】______ .

What explains these 【C5】______ in living arrangements across cultures？ Modernization theory 【C6】______ the extended family household to low levels of economic development. In traditional societies, the elderly live with their children in large extended family units for economic reasons. But with modernization, children move to urban areas, 【C7】______ old people behind in isolated 【C8】______ areas. Yet modernization theory cannot explain why extended family households were never common in the United States or England, or why families in Italy, which is fully modernized, maintain a strong 【C9】______ of intergenerational living. Clearly, economic development alone cannot explain 【C10】______ living arrangements.

Another theory associated intergenerational living arrangements with inheritance patterns. In some cultures, the stem family pattern of inheritance 【C11】______ . 【C12】______ this system, parents live with a married child, usually the oldest son, 【C13】______ then inherits their property when they die. The stem family system was once common in Japan, but changes in inheritance laws, 【C14】______ broader social changes brought 【C15】______ by industrialization and urbanization, have 【C16】______ the tradition. In 1960 about 80 percent of Japanese over 65 lived with their children; by 1990 only 60 percent did — a figure that is still high 【C17】______ U.S. standards, but which has been 【C18】______ steadily. In Korea, too, traditional living arrangements are 【C19】______ : the percentage of aged Koreans who live with a son declined from 77 percent in 1984 to 50 percent just 10 years later. 【C20】______ most elderly Koreans still expect to live with a son, their adult children do not expect to live with their children when they grow old.

【C1】

A．about

B．for

C．of

D．to

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第10题

A century ago, the immigrants from across the Atlantic inclued settlers and sojourners. Al

ong with the many folks looking to make a permanent home in the United States came those who had no intention to stay, and 7millin people arrived while about 2 million departed. About a quarter of all Italian immigrants, for exanmle, eventually returned to Italy for good. They even had an affectionate nickname, “uccelli di passaggio,” birds of passage.

Today, we are much more rigid about immigrants. We divide nemcomers into two categories: legal or illegal, good or bad. We hail them as Americans in the making, or our broken immigrantion system and the long political paralysis over how to fix it. We don’t need more categories, but we need to change the way we think about categories. We need to look beyond strick definitions of legal and illegal. To start, we can recognize the new birds of passage, those living and thriving in the gray areas. We might then begin to solve our immigration challenges.

Crop pickers, violinists, construction workers, entrepreneurs, engineers, home health-care aides and physicists are among today’s birds of passage. They are energetic participants in a global economy driven by the flow of work, money and ideas .They prefer to come and go as opportunity calls them , They can manage to have a job in one place and a family in another.

With or without permission, they straddle laws, jurisdictions and identities with ease. We need them to imagine the United States as a place where they can be productive for a while without committing themselves to staying forever. We need them to feel that home can be both here and there and that they can belong to two nations honorably.

Accommodating this new world of people in motion will require new attitudes on both sides of the immigration battle .Looking beyond the culture war logic of right or wrong means opening up the middle ground and understanding that managing immigration today requires multiple paths and multiple outcomes. Including some that are not easy to accomplish legally in the existing system.

“Birds of passage” refers to those who____ .

A.immigrate across the Atlantic.

B.leave their home countries for good.

C.stay in a foreign temporialy.

D.find permanent jobs overseas.

It is implied in paragraph 2 that the current immigration system in the US____ .A.needs new immigrant categories.

B.has loosened control over immigrants.

C.should be adopted to meet challenges.

D.has been fixed via political means.

According to the author, today’s birds of passage want___ .A.financial incentives.

B.a global recognition.

C.opportunities to get regular jobs.

D.the freedom to stay and leave.

The author suggests that the birds of passage today should be treated ____ .A.as faithful partners.

B.with economic favors.

C.with regal tolerance.

D.as mighty rivals.

Select the title that is most suitable for the articleA.come and go: big mistake.

B.living and thriving : great risk.

C.with or without : great risk.

D.legal or illegal: big mistake.

请帮忙给出每个问题的正确答案和分析，谢谢！

点击查看答案

第11题

In the United States many have been told that anyone can become rich and successful if he works hard and has some good luck.

Yet, when one becomes rich, he wants people to know it. And even if he does not become very rich, he wants people to think that he is. That is what “keeping up with the Joneses” is about. It is the story of someone who tries to look as rich and as successful as his neighbors.

The expression was first used in 1913 by a young American by the name of Arthur Momand. He told this story about himself: he began earning $125 a week at the age of 23. That was a lot of money in those days. Young Momand was very proud of his riches. He got married and moved with his wife to a very wealthy neighborhood outside New York City. But just moving there was not enough. When he saw that rich people rode horses, Momand went horse riding every day. When he saw that rich people had servants, Momand and his wife also hired a servant and gave big parties for their new neighbors.

It was like a race, but one could never finish this race because one was always trying to keep up. Momand and his wife could not do that.

The race ended for them when they could no longer pay for their new way of life. They left their wealthy neighborhood and moved back to an apartment in New York City.

Momand looked around him and noticed that many people do things just to keep up with their neighbors. He saw the funny side of it and started to write a series of short stories. He called it “keeping up with the Joneses”, because “Jones” is a very common name in the United States. “Keeping up with the Joneses” came to mean keeping up with the people around you. Momand’s series appeared in different newspapers across the country for over 28 years.

Every city has an area where people want to live because others will think better of them if they do. And there are “Joneses” in every city of the world. But one must get tired of trying to keep up with the Joneses, because no matter what one does, Mr. Jones always seems to be ahead.

6. The writer of the selection believes（）.

A. many people in the United States think anyone can become rich if he works hard and has some good luck

B. anyone in the United Sates can become rich if he works hard and has some good luck

C. he can become rich in the future

D. anyone in the United States can become rich

7. Some people want to keep up with the Joneses because（）.

A. they want to be as rich as their neighbors

B. they want others to know or to think that they are rich

C. they don’t want others to know they are rich

D. they want to be happy

8. It can be inferred from the story that rich people（）.

A. like to live in apartments

B. like to live in New York City

C. like to live outside New York City

D. like to have many neighbors

9. Arthur Momand used the name “Jones” in his series of short stories because Jones is（）.

A,. an important name

B. a popular name in the United States

C. his neighbor’s name

D. not a good name

10. According to the writer, it is（）.

A. correct to keep up with the Joneses

B. impossible to keep up with the Joneses

C. interesting to keep up with the Joneses

D. good to keep up with the Joneses

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