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1. Choose suitable translation of English words from Russian ones. Compose sentences with them on the topic of the text

Natural water sources естественные источники воды

body of water загрязнять(ся)

inland lake водный массив

water supply водоснабжение

water treatment подпочва

purity без примесей

contamination влага

sewage disposal system слой, пласт

pollution загрязнение (заражение)

through the medium система удаления сточных вод

under soil насыщенный

consumption обработка воды

moisture материковые озера

saturated загрязнение

to foul stratum при помощи, посредством

2. Chose the translation of bold type (выделенных) words.

1. discovery— а) решение; b) открытие; с) различие; d) сравнение

2.breadth— а) толщина; b) длина; с) высота; d) ширина

3.property— а) часть; b) свойство; с) давление; d) мощность

4.define— а) делить; b) определять; с) производить; d) понимать

5.numerous— а) целый; b) многочисленный; с) похожий; d) обычный

6.almost— а) почти; b) часто; с) вместе; d) просто

7.always— а) среди; b) иногда; с) всегда; d) быстро

8. угол— a) square; b) angle; с) circle; d) solid

9. исследование— a) dimension; b) field; c) subject; d) research

10. вес— a) thing; b) volume; c) weight; d) matter

11.улучшать— a) exist; b) improve; c) establish; d) explain

12.посылать— a) seem; b) supply; c) serve; d) send-

13.продолжать— a) continue; b) heat; c) revolve; d) turn

14.легкий— a) equal; b) easy; c) even; d) each

15.благодаря— a) during; b) such; c) ago; d) due to

16.иногда— a) together; b) usually; c) hard; d) sometimes

3.Point which of these sentences have the main idea of the text. Explain your point of view

1. On the earth water can be obtained from different natural sources. 2. At present the problems of water supply and treatment are the most essential for mankind. 3. Water taken from natural sources such as rivers and lakes often requires aeration.

4. Which of these statements contain the basic of the text. Put them in accordance with the context

1. An adequate supply of water is one of the main requirements for maintaining high standards of health. 2. Vast depressions in the earth filled with water and known as inland lakes are excellent sources of water. 3. The rivers and lakes contain a great amount of chemical and biological pollution. 4. Nowadays the problem of water treatment has become very urgent. 5. On the earth water passes through a very interesting physical cycle. 6. Water bodies deep in the soil are excellent sources of water. 7. Man after using water returns it to the source by means of sewerage systems; thus the cycle is completed. 8. Water is an important part of nature. 9. Man's earliest settlements were always close to natural water sources.