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[主观题]

Vitamins are organic compounds necessary in small amounts in the diet for the normal growt

h and maintenance of life of animals, including man.

They do not provide energy,【21】do they construct or build any part of the body. They are needed for【22】foods into energy and body maintenance. There are thirteen or more of them, and if【23】is missing a deficiency disease becomes【24】.

Vitamins are, similar because they are made of the same elements--usually carbon, hydrogen, oxygen, and【25】nitrogen. They are different【26】their elements are arranged differently, and each vitamin【27】one or more specific functions in the body.

【28】enough vitamins is essential to life, although the body has no nutritional use for【29】vitamins. Many people,【30】, believe in being on the "safe side" and thus take extra vitamins. However, a well-balanced diet will usually meet all the body's vitamin needs.

(36)

A．either

B．so

C．nor

D．never

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发布时间：2021-12-22

更多“Vitamins are organic compounds necessary in small amounts in the diet for the normal growt”相关的问题

第1题

Increasingly, over the past ten years, people -- especially young people have become aware

of the need to change their eating habits, because much of the food they eat, particularly processed food, is not good for the health. Consequently, there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers, widely used in farming today.

Natural foods, for example, are vegetables, fruit and grain which have been grown in soil that is rich in organic matter. In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount-- but not the quality -- of foods grown in commercial farming areas.

Natural foods also include animals which have been allowed to feed and move freely in healthy pastures. Compare this with what happens in the mass production of poultry: there are battery farms, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish. Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins.

There are other aspects of healthy eating which are now receiving increasing attention from experts on diet. It is significant that nowadays fiber is considered to be an important part of a healthy diet. In white bread, for example, the fiber has been removed. But it is presented in unrefined flour and of course in vegetables. It is interesting to note that in countries where the national diet contains large quantities of unrefined flour and vegetables, certain diseases are comparatively rare. Hence emphasis placed on the eating of whole meal bread and more vegetables by modem experts on "healthy eating."

According to this passage, people becoming interested in natural foods because ______.

A．they are getting fired of processed foods

B．they want to change their eating habits

C．a lot of the foods they eat is not healthy

D．food experts recommend them to have natural foods

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第2题

A. flour B. milk C. vitamins D. eggs

A.flour

B. milk

C. vitamins

D. eggs

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第3题

Vitamins do not provide energy, nor do they construct or build any part of the body. They

are needed for ______ foods into energy and body maintenance.

A．transforming

B．transferring

C．altering

D．shifting

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第4题

试利用Heilbron:Dictionary of Organic Compounds(5th版);MerckIndex(9th版)与Aldrich Catalog

试利用Heilbron:Dictionary of Organic Compounds（5th版);MerckIndex（9th版)与Aldrich Catalog

Handbook of Fine Chemicals(1992~1993)查:的物理常数合成、NMR与毒性文献.

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第5题

请以Food and Health为题写一篇文章。提示：在发达国家中，人们越来越多地意识（become aware of)

请以Food and Health为题写一篇文章。提示：在发达国家中，人们越来越多地意识(become aware of)到了饮食与健康之间的关系(link)。好的饮食包括蛋白(protein)、脂肪、维生素(vitamins)等等。然而，在发展中国家，相当一部分人仍然没有意识到健康饮食的重要性。结果，像癌症、心脏病这类疾病与日俱增。而在发达国家中，这类疾病日益减少。所以发展中国家的政府应该采取措施，鼓励人们重视正确饮食。注意：词数100左右。 Food and Health

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第6题

Genetically-modified (GM) foodstuffs are here to stay.That’s not to say that food prod

uced by conventional agriculture will disappear, but simply that food-buying patterns will polarize: there will be a niche market for conventional foodstuffs just as there is for organic food.It may even be that GM food will become the food of preference because consumers come to appreciate the health benefits of reduced pesticide use.

Currently there are some 20,000 chemicals in use, but the scientists only have detailed information around 1,000 of them.To see the advantages of GM food you have only to consider the recent press revelation that the average lettuce receives eleven pesticide applications before it reaches the supermarket shelf.I’m sure chemicals and their role in disease will become a big issue in the 21st century as the population of the developed world worries increasingly about its health.

The reason GM food will not go away is that we need a three-fold increase in food production by the year 2050 to keep pace with the world’s predicted population growth to ten or eleven billion.It’s not just a question of more mouths to feed either.What is often forgotten is that all these extra people will take up space, reducing the overall land available for agriculture.

The world has 800 million hungry people.Until now, food supplies have been increased by improved varieties, pesticides and artificial fertilizers: the green revolution.Now we’re on the edge of a new one: a genetic revolution.

It may well be that in the long term it is the developing world that benefits most from GM food.It is true that for the next years or so GM crops may be too expensive.

6. According to the passage, food supplies have been increased by all the following except_____________.

A.pesticides

B.artificial fertilizers

C.improved varieties

D.transportation

7.How many chemicals are still less familiar to the scientists？()

A.20,000.

B.1,000

C.19,000

D.21,000.

8.Why will people prefer GM food in the future？()

A.Because it uses less pesticides.

B.Because it is much cheaper.

C.Because the production is increased.

D.Because it is organic food.

9.Which of the following is NOT true？()

A.By 2050, the world population will grow to ten or eleven billion.

B.In the 21st century, GM food will take the place of conventional food.

C.More and more people will reduce the overall land available for farming.

D.More and more people will consume more food and occupy more space.

10.The author’s attitude towards GM food is _______.

A.negative

B.positive

C.critical

D.uncertain

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