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GM foods are developed and marketed because of better taste, nutrition，increased profit for growers, biodiversity，safety and virus resistance，etc.

提问人：网友charpin 发布时间：2022-01-07

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更多“GM foods are developed and mar…”相关的问题

第1题

根据下列材料，请回答题Food FrightExperiments under way in several labs aim to create benefi

根据下列材料，请回答题

Food Fright

Experiments under way in several labs aim to create beneficial types of genetically modified （GM） foods， including starchier potatoes and caffeine-free coffee beans. Genetic engineers are e-yen trying to transfer genes from a cold-water 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 to enjoy the little delicious red fruits again. GM beans and grains supercharged with protein 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， 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 made by Btcorn， which makes up one-fourth of the U. S. corn crop. The scientist sprinkled the pollen on to milkweed， a plant that makes a milky juice and is the only known food source of the monarch butterfly caterpillar. Within four days of munching on the milkweed leaves ~ almost half of a test group of caterpillars had died. "Monarchs are considered to be a flagship species for conservation，" said

Cornell researcher Linda Raynor. "This is a warning bell. "

Some insects that are not killed by GM foods might find themselves made stronger. How so？ The insecticides used to protect most of today"s crops are sprayed on the crops when needed and decay quickly in the environment. But GM plants produce a continuous level of insecticide. Insect species feeding on those crops may develop resistance to the plants and could do so in a hurry， say the critics. Insects may also develop a resistance to the insecticide Bt.

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 foods be banned in the United States， as they are in parts of Europe？ Or do their benefits outweigh any of the risks they might carry？

Paragraphs 1，2&3 try to give the idea that 查看材料

A.GM foods are particularly good to the kwashiorkor patients

B.GM foods may have both benefits and harm

C.we cannot recognize the benefits of GM foods too early

D.GM foods may bring about great benefits to humans

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第2题

Why is the case of the pollen-sprayed milkweed cited in Paragraph 6？

查看材料

A.It is cited to show GM foods can kill insects effectively.

B.It is cited to show GM foods contain more protein.

C.It is cited to show GM foods also have a dark side.

D.It is cited to show GM foods may harm crops.

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第3题

What is the writer‘s attitude to GM foods？查看材料A.He

What is the writer‘s attitude to GM foods？查看材料

A.He thinks their benefits and risks are balanced.

B.He thinks their risks outweigh their benefits.

C.He thinks their benefits outweigh their risks.

D.We cannot tell from the passage.

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第4题

Which of the following statements concerning banning GM foods is true according to the pas

sage？查看材料

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.

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第5题

Why is the debate on genetically modified foods more heated in developing countries？A．They

Why is the debate on genetically modified foods more heated in developing countries？

A．They have a rich range of foods.

B．They like traditional and natural food.

C．They have to feed fast-growing populations.

D．The risks of GM food outweigh the benefits.

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第6题

Which of the following is the strongest argumentative thesis？

A、Genetically modified foods have become a major concern of the society and have caused great controversy.

B、While there may be economic benefits of growing genetically modified crops, there are negative health consequences for the people who consume them and for the farmers who produce them.

C、This essay will discuss the health and safety issues as related to genetically modified foods.

D、GM foods need to be tested on a case-by-case basis before introduction.

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第7题

Some people think that the real reason for the GM to develop the electric car is to pressu

re environmental regulators into lowering emission standards.

A．Y

B．N

C．NG

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第8题

Directions: In this part, you will have 15 minutes to go over the passage quickly and answ

er the questions on Answer Sheet 1.

For questions 1—4, mark

Y(for YES) if the statement agrees with the information given in the passage;

N(for NO) if the statement contradicts the information given in the passage;

NG(for NOT GIVEN) if the information is not given in the passage.

For questions 5—10, complete the sentences with the information given in the passage.

GENETICALLY MODIFIED FOODS

Are genetically modified crops an environmental dream come- true or a disaster in the making？ Scientists are looking for answers.

The world seems increasingly divided into those who favor genetically modified (GM) foods and those who fear them. Advocates assert that growing genetically altered crops can be kinder to the environment and that eating foods from those plants is perfectly safe. And, they say, genetic engineering which can induce plants to grow in poor soils or to produce more nutritious foods will soon become an essential tool for helping to feed the world's burgeoning population. Skeptics contend that GM crops could pose unique risks to the environment and to health risks too troubling to accept placidly. Taking that view, many European countries are restricting the planting and importation of GM agricultural products. Much of the debate hinges on perceptions of safety. But what exactly does recent scientific research say about the hazards？ The answers, too often lost in reports on the controversy, are served up in the pages that follow.

Two years ago in Edinburgh, Scotland eco - vandals stormed a field, crushing canola plants. Last year in Maine, midnight raiders hacked down more than 3,000 experimental poplar trees. And in San Diego, protesters smashed sorghum and sprayed paint over greenhouse walls.

This far - flung outrage took aim at genetically modified crops. But the protests backfired: all the destroyed plants were conventionally bred. In each case, activists mistook ordinary plants for GM varieties.

It's easy to understand why. In a way, GM crops—now on some 109 million acres of farmland worldwide—are invisible. You can't see, taste or touch a gene inserted into a plant or sense its effects on the environment. You can't tell, just by looking, whether pollen containing a foreign gene can poison butterflies or fertilize plants miles away. That invisibility is precisely what worries people. How, exactly, will GM crops affect the environment- and when will we notice？

Advocates of GM, or transgenic, crops say the plants will benefit the environment by requiring fewer toxic pesticides than conventional crops. But critics fear the potential risks and wonder how big the benefits really are. "We have so many questions about these plants," remarks Guenther Stotzky, a soil microbiologist at New York University. "There's a lot we don't know and need to find out."

As GM crops multiply in the landscape, unprecedented numbers of researchers have started fanning into the fields to get the missing information. Some of their recent findings arc reassuring; others suggest a need for vigilance.

Fewer Poisons in the Soil？

Every year U. S. growers shower crops with an estimated 971 million pounds of pesticides, mostly to kill insects, weeds and fungi. But pesticide residues linger on crops and the surrounding soil, leaching into groundwater, running into streams and getting gobbled up by wildlife. The constant chemical trickle is an old worry for environmentalists.

In the mid - 1990s agribusinesses began advertising GM seeds that promised to reduce a farmer's use of toxic pesticides. Today most GM crops—main

A．Y

B．N

C．NG

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第9题

GENETICALLY MODIFIED FOODSAre genetically modified crops an environmental dream come-true

GENETICALLY MODIFIED FOODS

Are genetically modified crops an environmental dream come-true or a disaster in the making？ Scientists are looking for answers.

The world seems increasingly divided into those who favor genetically modified(GM) foods and those who fear them Advocates assert that growing genetically altered crops can be kinder to the environment and that eating foods from those plants is perfectly safe. And, they say genetic engineering which can induce plants to grow in poor soils or to produce more nutritious foods will soon become an essential tool for helping to feed the world's burgeoning population. Skeptics contend that GM crops could pose unique risks to the environment and to health risks too troubling to accept placidly, Taking that view, many European countries are restricting the planting and importation of GM agricultural products. Much of the debate hinges on perceptions of safety. But what exactly does recent scientific research say about the hazards？ The answers, too often lost in reports on the controversy, are served up in the pages that follow.

Two years ago in Edinburgh, Scotland, eco-vandals stormed a field, crushing canola plants. Last year in Maine, midnight raiders hacked down more than 3000 experimental poplar trees. And in Sun Diego, protesters smashed sorghum and sprayed paint over greenhouse walls.

This far-flung outrage took aim at genetically modified crops. But the protests backfired: all the destroyed plants were conventionally bred. In each case, activists mistook ordinary plants for GM varieties.

Advocates of GM, or transgenic, crops say the plants will benefit the environment by requiting fewer toxic pesticides than conventional crops. But critics fear the potential risks and wonder how big the benefits really are. "We have so many questions about these plants," remarks Guenther Stotzky, a soil microbiologist at New York University. "There's a lot we don't know and need to find out."

Fewer Poisons in the Soil？

Every year U.S. growers shower crops with an estimated 971 million pounds of pesticides, mostly to kill insects, weeds and fungi. But pesticide residues linger on crops and the surrounding soil, leaching into groundwater, running into streams and getting gobbled up by wildlife. The constant chemical trickle is an old worry for environmentalists.

In the mid-1990s agribusinesses began advertising GM seeds that promised to reduce a farmer's use of toxic pesticides. Today most GM crops-mainly soybean, com, cotton and canola-contain genes enabling them to either resist insect pests or tolerate weed-killing herbicides. The insect-resistant varieties make their own insecticide, a property meant to reduce the need for chemical sprays. The herbicidetolerant types survive when exposed to broad-spectrum weed killers, potentially allowing farmers to forgo more poisonous chemicals that target specific weed species. Farmers to limit the use of more hazardous pesticides when they can, but GM crops also hold appeal because they simplify operations (reducing the frequency and complexity of pesticide applications) and, in some cases, increase yields.

A．Y

B．N

C．NG

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第10题

II. Rearrange each of the following sentences, so ...

II. Rearrange each of the following sentences, so as to make it a coherent paragraph. （10%）（共10分，每题2分） A. Of the effects caused by vitamin A deficiency, those involving eye diseases are the most pronounced and widespread. B. Another result of vitamin A deficiency is skin dryness. C. What children eat can affect their health. D. Several thousand children become blind each because of this dietary deficiency, which is most prevalent in poor, non- industrialized countries. E. Children who do not eat enough foods containing vitamin A can develop serious nutritional disorders.

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