2. Сравните данные пары предложений:

1. To analyse the composition of derived compounds is not an easy task. To analyse the derived compound they have decomposed it in­to its constituents.

2. To complete the investigation of this fatty acid was extremely important. To complete the investigation successfully they have made a great deal of preparatory work.

3. To mix these substances you should know their properties. To mix these substances thoroughly is very important for our experiment.

4. To keep bread fresh requires its storage under proper condi­tions. To keep bread fresh it must be stored in special contain­ers or wrapped in cellophane.

5.To stop the spoilage caused by microorganisms it is necessary to lower the temperature. To stop the spoilage caused by microorga­nisms means first of all the creation of unfavorable conditions for their activity.

4. Составьте утверждения, подобрав соответствующее начало из левой колонки.

1.	а) To meet the body’s need for energy the human diet ... b) To meet the body’s need for energy …	should include foods rich in carbohydrates, proteins and fats.
2.	To build and repair tissues ... To build and repair tissues the human diet ...	is the function of such food constituents as proteins and minerals.
3.	To be digested by a body ... To be digested food ...	must undergo great changes in the human body.
4.	To prevent the body from diseases оne ... To prevent the body from diseases …	is the concern of both doctors and nutritionists.
5.	To regulate body processes it ... To regulate body processes ...	is regarded as a particular function of water.
6.	To determine the chemical structure of vitamins ... To determine the chemical structure of vitamins scientists ...	was a very complicated process.

Упражнения по грамматической теме " многофункциональность "it, one, that "

I. Переведите на русский язык данные предложения ,определив подчерк­нутые слова.

1. IT-1. личное мест.З л.ед. ч.для неодушевленных предметов

2. указательное местоимение "это"

3. безличное местоимние в роли формального подлежащего

4. элемент усилительной конструкции"It is...that/who"

1. The more vitamins food contains the more nutritive it is. 2. It was found that

the baby diet should include milk. 3. Milk is essential for nutrition as it is of great nutritive value. 4. It is necessary to examine the influence of heat on vitamins. 5. It is vitamins that play an important part in nutrition. 6. Vitamin С is the least stable of all the vitamins and it readily oxidizes. 7. It will be quite possible to analyse the constituents of the new product by this method. 8. It is a water that helps the body to digest food. 9. A human body needs much protein and it is supplied with it through various foods. 10. It is significant to determine the role of carbohydrates in nutrition.

B. ONE 1. количественное числительное "один"

2. неопределенно-личное местоимение – формальное подлежащее

3. заменитель существительного (во избежании повторения)

1. One should include various foods into the diet. 2. One food may supply energy, another may regulate body processes. 3. This substance has higher protein content than that one. 4. Many kinds of food contain more than one protein. 5. A complete protein is one that is essential to support normal growth of the living organism. 6. Unlike most of vitamins this one is stable to heat. 7. Water is one of the commonest substances in nature. 8. One may regard food as the main source of life. 9. One of the most valuable sources of carbohydrates is hony. 10. One must know that salt is the symbol of lasting food quality.

C. THAT I. указательное местоимение "тот" /those "-те"/

2. заменитель существитeльного/во избежании повторения/

3. часть усилительной конструкции"it is...that"

4. союз придаточного предложения:

а) дополнительного - "что", чтобы" б) сказуемого -"что"

в) определительного -"который" г) подлежащего - "то, что"

I. The utilization of salt for food preservation is similar to that of sugar. 2. Ascorbic acid belongs to those commonly found in citrus fruit. 3. Proteins that we generally recognize as complete and those that are partially complete and incomplete must be carefully studied. 4. That salt makes food tasty was known to people long ago. 5. Food that provides the body with vitamins and minerals are fruit and vegetables. 6. That vitamin was prepared synthetically. 7. That sugar serves as a source of energy for the growth of a plant was discovered in the 18^th century. 8. The problem is that human diet should be not only well-balanced but also varied. 9. The food value of this substance is much lower than that of its derivatives. 10. It is the variation in the quality of proteins that has resulted in their classification.