Unit 5 writing 【新教材】人教版2019选择性必修第一册同步课件 (共17张PPT)

Working The Land 人教（2020）选择性必修一 Unit 5 2020.10 CHEMICAL VERSUS ORGANIC FARMING Evaluate chemical farming and organic farming para1-2 para3 para4 para5 bacteria and insects prohibited damage they cause to people and the environment grow too fast water inside natural waste from animals change the kind of crop every year different depths demand for food around the world A. What organic farming is B. Why man -made chemicals are still used in farming C. Organic methods for producing rich soil D. The problems with chemical farming D A C B Read again, and make comparisons between chemical farming and organic farming. 1.widespread use since the middle of the 20th century 2.kill harmful bcteria and insects soil waste plankton water chemical farming 1.Organic farming is simply farming without using any chemicals. 2.through natural means 3.use natural waste from animals as fertiliser 4.change the kind of crop grown . organic farming According to the