At present all the farms in russia have been electrified. over 90 per cent of the electric power consumers in the countryside rely on electricity supplied by the centralized state system. fully electrified production complexes, which ensure high labour productivi-ty, improve the quality of products and reduce their prime cost, are becoming more and more widespread in agriculture. not unfrequent are at present the instances when one or more hundred electric motors operate on a farm. electric motors as a matter of fact take care of all kinds of stationary work. they operate irrigation, pumps, threshing and fanning, as well as grain-drying units. electrical machines supply water to the cowhouse and when necessary heat it, cut ensilage, actuate milking machines, prepare provender in the feed-processing building, feed it to the cattle, remove barnyard manure. electric incubators hatch chicks and ducklets, while eggs are electrically gathered, graded and packed on the line. sheep are nowadays being sheared electrically; this is by far quicker and more efficient than the old hand-method while the clip is greater and of higher quality. of late electricity has found a new sphere of application as the source of ultraviolet and infrared rays which contribute to metabolism and to the growth and healthy development of young domestic animals. ultraviolet irradiation units are effective in preventing and curing rachitis. on the fields electricity is so far being used to a comparatively small extent, but the day is near when eleсtriс ploughing and other field-work will become routine practice. 1. what ensures high labour productivity and improves the quality of products? 2. what instances are not unfrequent at present? 3. where do electrical machines supply water to? 4. how are sheep nowadays being sheared? ответы на вопросы я нашел, но не помню как на них ответить по-.
1. I have been reading this book for three days.
2. We have been playing volleyball for twenty minutes.
3. She has been cleaning the flat for more than an hour.
4. Peter has been swimming for half an hour.
5. Anna has been speaking on the phone for an hour now.
6. You have been waiting for a bus for ten minutes only.
7. Nelly and Mary have been doing the shopping since early morning.
8. It has been snowing since last night.
9. Jack and his friend have been riding bikes for three hours now.
10. The teacher has been explaining a grammar rule since the beginning of the lesson.
1) I have been reading this book for three days.
2)We have been playing volleyball for twenty minutes.
3)She has been cleaning the flat for more than an hour.
4)Peter has been swimming for half an hour.
5)Anna has been speaking on the phone for an hour now.
6)You have been waiting for a bus for ten minutes only.
7)Nelly and Mary have been doing the shopping since early morning.
8)It has been snowing since last night.
9)Jack and his friend have been riding bikes for three hours now.
10)The teacher has been explaining a grammar rule since the beginning of the lesson.
Объяснение: