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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：2020-09-14

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

第1题

The United States ______ Alaska and Hawaii stretches across central North America from

A.includes

B.including

C.excluding

D.excludes

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第2题

What does the author say about straight, horizontal bars painted across roads？A) Th

What does the author say about straight, horizontal bars painted across roads？

A) They are falling out of use in the United States.

B) They tend to be ignored by drivers in a short period of time.

C) They are applicable only on broad roads.

D) They cannot be applied successfully to traffic circles.

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第3题

What may happen if the United States places obstacles in the way of foreign investors an

d foreign goods？

A.The prices of imported goods will inevitably soar beyond control.

B.The investors will have to make great efforts to reallocate capital.

C.The wealthy will attempt to buy foreign companies across borders.

D.Foreign countries will place the same economic barriers in return.

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第4题

What may happen if the United Stated places obstacles in the way of foreign investors and

foreign goods？

A．The prices of imported goods will inevitably soar beyond control.

B．The investors will have to make great efforts to re-allocate capital.

C．The wealthy will attempt to buy foreign companies across borders.

D．Foreign countries will place the same economic barriers in return.

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第5题

What may happen if the United States places obstacles in the way of foreign investors

and foreign goods？

A) The prices of imported goods will inevitably soar beyond control.

B) The investors will have to make great efforts to re-allocate capital.

C) The wealthy will attempt to buy foreign companies across borders.

D) Foreign countries will place the same economic barriers in return.

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第6题

Which of the following sentences is NOT true according to the passage？ A. The United St

Which of the following sentences is NOT true according to the passage？

A. The United States was once considered the best in industrial research. B ) Japanese high school students know much more than their American peers. C )Only in these years have American students fallen behind foreigners in academic knowledge. D ) One out of four American teenagers choose to work before they finish high school education.

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第7题

听力原文：M: Do you think the travel agency will be open Saturday afternoon？ I want to get

some information about a bus trip across the United States.

W: You don't have to wait Until Saturday. Right here, in this office, the dean has maps, bus schedules and even a list of inexpensive hotels. They're for foreign students, you know.

Q: Where did this conversation most probably take place？

(19)

A．This conversation was at the airport.

B．They were eating lunch and talking in a restaurant.

C．This took place in a college information office.

D．They were at the dean's home.

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第8题

听力原文：The problem of the homeless has become very serious in the United States. Almost

听力原文： The problem of the homeless has become very serious in the United States. Almost in every community, you can find homeless people. An ironical case is: in November, 1993, a woman died on a street in Washington, D.C., the nation's capital, and she died at a bus-stop across the street from the US Department of Housing and Urban Development.

People become homeless for various reasons. Some may not be able to pay for the housing they used to have, because they have lest their job and cannot find another place they can afford. Others have mental disorders, or are addicted to drags or alcohol, and there are not enough centres to care for them.

As ways to help these people, the federal government and many communities have set up all kinds of projects. Some programs include permanent housing, training for jobs and treatment for people who are addicted to drugs or alcohol. Some communities have opened centers that offer services for as many as 700 people. The homeless can stay as long as they want.

People are making efforts to solve the problem. However, it will not be easy, because it is a personal and economic problem as well as a social problem.

(33)

A．She died across from the US Department of Housing and Urban Development.

B．US Department of Housing and Urban Development threw the dead woman out onto the street.

C．She died in Washington D.C., the nation's capital.

D．No one cared about the homeless woman.

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第9题

听力原文： It has been reported that in colleges across the United States,the daytime seria

听力原文： It has been reported that in colleges across the United States, the daytime serial drama known as the soap opera has suddenly become "in" among the students. Between the hours of 11:00 a. m. and 4:30 p. m., college television lounges are filled with soap opera fans who can't wait to see the next episode in the lives of their favorite characters.

Actually, soap operas are more than a college favorite; they're a youth favorite. When school is out, high school students are in front of their TV sets, waiting for the programs. One young working woman admitted that she turned down a higher paying job rather than give up watching her favorite serials. The soap operas have become part of people's lives. During the 1960s,it was uncommon for young*people to watch soap operas. The mood of the sixties was very different from now. It was a time of seriousness, and talk was about social issues of great importance.

Now, scri0usness has been replaced by fun. Young people want to be happy. It may seem strange that they should turn to soap operas, which are known for showing trouble in people's lives. But soap operas are enjoyment. Young people can identify with the soap opera character, who, like the college-age viewer, is looking for happy love, and probably not finding it. And soap operas give young people a chance to feel close to people without having to bear any responsibility for their problems.

(33)

A．Plays based on science fiction stories.

B．Plays based on non-fiction stories.

C．The daytime serial dramas on TV.

D．Popular documentary films on TV.

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第10题

听力原文：Federal Express is a private airline service which expands the Postal Service in

听力原文： Federal Express is a private airline service which expands the Postal Service in the United States. It is the only U. S. airline specializing in the transportation of small packages--35 kilos or less.

Federal Express links 130 major U. S. cities and 10,000 surrounding communities. An urgent package picked up in one part of the country this afternoon can be delivered to any other part of the country tomorrow morning. All of the Federal Express jets fly into the International Airport at Memphis, Tennessee, because it is located in the center of the United States.

The sorting facility for Federal Express is called "The Hub." Every night, from about 12 midnight to 3 a. m. , the packages are gathered and sorted into shipments for specific destinations. The main labor force is comprised of students working part-time.

Since Federal Express started business in 1971, it has flown millions of air kilometers without failure. In the space of one hour, 39 jets will take off to destinations all across the United States.

(33)

A．Its specialization in transporting small packages.

B．The low cost of its service.

C．Being the first airline to send urgent letters.

D．Its modern sorting facilities.

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