Помогите перевести предложения,обратив внимание на время .
1. Farmers did not know much about nutrients in the 17 yh century.
2.After Columbus had discovered America he brought some new varietes of plants to Europa .
3. In 1870 Pavlov entered the University of St.Petersburg where he studied chemistry and physiology .
4. The milk yields have fallen and some animals have become sick.
5.Scientists are going to continue their research in the field of animal nutrition .
6. Nowadays farmers are trying to satisfy the peoples requirements in highly nutritive products.
7. In the past,farmers had much difficulty in feeding cattle during the winter season
8. Two centuries ago farmers used their own practical experience to satisfy animals with feeds .
9. Farmers often produce high-quality butter and cream from milk.
10. Farmers will rely on the record of an individual animal`s ancestors .
11. Chemical genetics remains a basis for all other topics in genetics
12 . At present farmers are using different breeding programmes to improve their herds.
13. They will have returned before you come home.
14. Before the dog attacks a potential enemy ,it will show signs of hostility .
15. Recently ,several organizations have established conservation programmes for endangered domestic breeds of cattle ,sheep and swine .
16. When the weather is rainy,windy and cold,cattle will decrease the grazing time and drink little water.
17. Many naturalists have studied aspects of animal behaviour through the centuries .
18. In 1949 Frisch established that bees use the sun as a compass.
19. Poor preventive measures have resulted in a rapid spread of infection among sheep .
20. If farmers apply modern cultivation practices ,yields of forage crops will be higher.
Ответ:
Объяснение:
Organic food is very popular these days. It can also be very___expensive________. Some organic food costs twice as much as non-organic food. Parents of young children, and even some pet owners, will pay high prices for organic food if they think it’s healthier. But many others think organic food is just a__waste of money_________.
There is one main difference between organic and non-organic food. Organic farms do not use _ agricultura_____chemicals such as pesticides that stop insects from damaging crops. In many countries foods that claim to be organic must have special labels that guarantee they’re grown organically.
Some people think organic also means «locally grown», and originally this was true. But over time organic farming has become big business, with many organic foods now being grown by large agricultural companies that sell their products far from where they’re grown. Processed food made with organic _____ ingredients _____ has also become more popular. At first, only small companies ____produced ___these products. But as______demand ___ overtook___ supply __________, big food companies that had been selling non-organic products for many years also began selling organic products. Small organic food companies found it difficult to compete with these big companies, and many didn’t stay in business much longer.