Unit5 Using language ppt课件 -（2019）新人教版高中英语选择性必修第一册.pptx

1、选择性必修一 Unit 5 Using language Evaluate chemical farming and organic farming Reading for Writing Chemical Versus Organic Farming It is fertilizer. What is the substance we put on the soil to make crops grow? Pre-reading What kind of fertilizers do farmers use? chemical fertilizers natural fertilizers

2、Whatre the advantages of organic farming? Do you usually eat organic food? Do you think organic food are more healthy? What are the disadvantages of using chemical fertilizers? Thinkdiscuss Organic Farming organic farming chemical farmingorganic farming organic farmingchemical farmingorganic farming

3、 Fast-reading 1. Why did many farmers welcome the introduction of chemical farming? Many farmers welcomed them as a great way to fight crop diseases and increase production. 2. How is organic farming different from chemical farming? Organic farming is simply farming without using any chemicals. Orga

4、nic farmers focus on keeping their soil rich and free of diseases through natural means. Para 1 Chemical Versus Organic Farming Chemical pesticides and artificial fertilisers have been in widespread use in farming since the middle of the 20th century. When they were first introduced, many farmers we

5、lcomed them as a great way to fight crop disease and increase production. Over time, however, what some scientists have found is that their long-term use can sometimes harm both the land and peoples health. What is the main idea ？ The advantages and also the problems of chemical farming . Chemical V

6、ersus Organic Farming Chemical pesticides and artificial fertilisers have been in widespread use in farming since the middle of the 20th century. When they were first introduced, many farmers welcomed them as a great way to fight crop disease and increase production. Over time, however, what some sc

7、ientists have found is that their long-term use can sometimes harm both the land and peoples health. versus vss prep.（表示两队）对（表示两队）对; 与与相对相对/ 比较比较 chemical Versus organic farming化学与有机农业的比较化学与有机农业的比较 chemical pesticides 化学农药化学农药 artificial fertilisers 人工肥料人工肥料 in widespread use 在广泛使用在广泛使用 in widesprea

8、d use in farming 在农业中广泛的应用在农业中广泛的应用 since the middle of the 20th century 自自20世纪中叶以来世纪中叶以来 welcome .as .作为作为.欢迎欢迎. a great way to fight crop disease and increase production 一个防治作物病害和提高产量的好办法一个防治作物病害和提高产量的好办法 over time 随着时间的推移随着时间的推移 harm sb/sth=be harmful to sb/sth =do sb/sth harm =do harm to sb/sth

9、损害损害. versus vss prep.（表示两队）对（表示两队）对; 与与相对相对/ 比较比较 chemical Versus organic farming化学与有机农业的比较化学与有机农业的比较 chemical pesticides 化学农药化学农药 artificial fertilisers 人工肥料人工肥料 in widespread use 在广泛使用在广泛使用 in widespread use in farming 在农业中广泛的应用在农业中广泛的应用 since the middle of the 20th century 自自20世纪中叶以来世纪中叶以来 welco

10、me .as .作为作为.欢迎欢迎. a great way to fight crop disease and increase production 一个防治作物病害和提高产量的好办法一个防治作物病害和提高产量的好办法 over time 随着时间的推移随着时间的推移 harm sb/sth=be harmful to sb/sth =do sb/sth harm =do harm to sb/sth 损害损害. Para 2 For example, pesticides can damage the land by killing not only harmful bacteria a

11、nd insects, but also helpful ones. In addition, these chemicals can stay in the soil and underground water sources for a long time. This affects the crops grown on the land and, in turn, the animals and humans who digest them. Many people worry that these chemicals may make them ill and even cause c

12、ancer. In fact, some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment. As for chemical fertilisers, crops grown with them usually grow too fast to be rich in nutrition. They may look beautiful on the outside, but inside there i

13、s usually more water than essential minerals, and they often have less flavour as well. What is the main idea ？The problems of chemical farming . For example, pesticides can damage the land by killing not only harmful bacteria and insects, but also helpful ones. In addition, these chemicals can stay

14、 in the soil and underground water sources for a long time. This affects the crops grown on the land and, in turn, the animals and humans who digest them. Many people worry that these chemicals may make them ill and even cause cancer. In fact, some pesticides like DDT have been prohibited in most co

15、untries because of the damage they cause to people and the environment. As for chemical fertilisers, crops grown with them usually grow too fast to be rich in nutrition. They may look beautiful on the outside, but inside there is usually more water than essential minerals, and they often have less f

16、lavour as well. for example/instance 例如例如 in addition 此外此外 damage sb/sth = do/cause damage to sb/sth 损坏损坏.; 伤害伤害. these chemicals 这些化学物质这些化学物质 stay in the soil and underground water sources 在土壤和地下水源中停留在土壤和地下水源中停留 for a long time 很长时间很长时间 in turn反过来反过来;转而转而;轮流轮流;依次依次 cause cancer 致癌致癌 in fact事实上事实上 b

17、e prohibited 被禁止被禁止 as for. 至于至于. cause damage to. 对对.造成损坏造成损坏/带来损害带来损害 chemical fertilisers 化肥化肥 be rich in 富有富有的的 look beautiful on the outside从外表上看起来漂亮从外表上看起来漂亮 have less flavour 味道较差味道较差 as well 也，也， 还有还有 for example/instance 例如例如 in addition 此外此外 damage sb/sth = do/cause damage to sb/sth 损坏损坏.;

18、 伤害伤害. these chemicals 这些化学物质这些化学物质 stay in the soil and underground water sources 在土壤和地下水源中停留在土壤和地下水源中停留 for a long time 很长时间很长时间 in turn反过来反过来;转而转而;轮流轮流;依次依次 cause cancer 致癌致癌 in fact事实上事实上 be prohibited 被禁止被禁止 as for. 至于至于. cause damage to. 对对.造成损坏造成损坏/带来损害带来损害 chemical fertilisers 化肥化肥 be rich i

19、n 富有富有的的 look beautiful on the outside从外表上看起来漂亮从外表上看起来漂亮 have less flavour 味道较差味道较差 as well 也，也， 还有还有 Para 3 As an alternative, some farmers have switched to organic farming, and many customers have turned to organic food when they shop at the local grocery. Organic farming is simply farming without

20、 using any chemicals. Organic farmers focus on keeping their soil rich and free of disease through natural means. For example, many organic farmers use natural waste from animals as fertiliser. This makes the soil in their fields richer in minerals. It also keeps the air, soil, water, and crops free

21、 of chemicals. What is the main idea ？ What organic farming is. As an alternative, some farmers have switched to organic farming, and many customers have turned to organic food when they shop at the local grocery. Organic farming is simply farming without using any chemicals. Organic farmers focus o

22、n keeping their soil rich and free of disease through natural means. For example, many organic farmers use natural waste from animals as fertiliser. This makes the soil in their fields richer in minerals. It also keeps the air, soil, water, and crops free of chemicals. as an alternative 作为一种选择作为一种选择

23、 switch / turn to .改改/转向转向. farm without using any chemicals不使用任何化学物质的耕作不使用任何化学物质的耕作 focus on doing专注于专注于. keep free of .使使免于免于 through natural means通过自然的手段通过自然的手段 use . as .使用使用作为作为. as an alternative 作为一种选择作为一种选择 switch / turn to .改改/转向转向. farm without using any chemicals不使用任何化学物质的耕作不使用任何化学物质的耕作 f

24、ocus on doing专注于专注于. keep free of .使使免于免于 through natural means通过自然的手段通过自然的手段 use . as .使用使用作为作为. Para 4 Organic farmers also use many other methods to produce rich soil. They often change the kind of crop grown in each field every year. For instance, they may grow corn or wheat in a field one year,

25、 and then grow beans there the next. Why different crops are grown is because they put important minerals back into the ground, making it ready again for the next batch of crops. Organic farmers also plant diverse crops that use different depths of soil to help keep it rich. For example, peanuts gro

26、w on the grounds surface, but many other vegetables put down deep roots. The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to peoples health. What is the main idea ？ Organic methods to produce rich soil. Organic farmers also use many

27、 other methods to produce rich soil. They often change the kind of crop grown in each field every year. For instance, they may grow corn or wheat in a field one year, and then grow beans there the next. Why different crops are grown is because they put important minerals back into the ground, making

28、 it ready again for the next batch of crops. Organic farmers also plant diverse crops that use different depths of soil to help keep it rich. For example, peanuts grow on the grounds surface, but many other vegetables put down deep roots. The goal of using different organic farming methods is to gro

29、w good food while avoiding damage to the environment or to peoples health. produce rich soil 培养肥沃的土壤培养肥沃的土壤 the kind of crop grown in each field 在每块田里种植的作物种类在每块田里种植的作物种类 Why different crops are grown is. 为什么要种植不同的农作物是为什么要种植不同的农作物是. put . back into the ground 把把.放回地里放回地里 use different depths of soil

30、利用不同深度的土壤利用不同深度的土壤 on the grounds surface 在地表在地表 put down deep roots 深扎根深扎根 avoid damage to.避免损坏到避免损坏到. produce rich soil 培养肥沃的土壤培养肥沃的土壤 the kind of crop grown in each field 在每块田里种植的作物种类在每块田里种植的作物种类 Why different crops are grown is. 为什么要种植不同的农作物是为什么要种植不同的农作物是. put . back into the ground 把把.放回地里放回地里

31、use different depths of soil 利用不同深度的土壤利用不同深度的土壤 on the grounds surface 在地表在地表 put down deep roots 深扎根深扎根 avoid damage to.避免损坏到避免损坏到. Para 5 Some people would prefer to stop the use of man-made chemicals in agriculture entirely. What keeps them from doing so is the fact that chemical farming serves t

32、he high demand for food around the world. Organic farming is nowhere near able to meet that need. Therefore, there is still a long way to find a suitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible. What is the main idea ？ Wh

33、y man-made chemicals are still used in farming . Some people would prefer to stop the use of man-made chemicals in agriculture entirely. What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world. Organic farming is nowhere near able to meet that

34、 need. Therefore, there is still a long way to find a suitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible. Answer the following questions:(p56) 1. Why did many farmers welcome the introducton of chemical farming? Many farmer

35、s welcomed them as a great way to fight crop diseases and increase production. 2. What concerns many people about the use of pesticides? 3.What is one problem with the use of chemical fertilisers? These chemicals may make them ill and even cause cancer. Crops grown with them usually frow too faast t

36、o be rich in nutrition 4.How is organic farming different from chemical farming? 5.Why do organic farmers change the kind of crop grown in a fiels every year? Organic farming is simply farming without using any chemicals. organic farmers focus on keeping their soil rich and free of disease throught

37、natural means Different crops are grown to put important minerasl back into the ground, making it ready for the next batch of crops. 6. What is the goal of using organic farming methods? Do you think it can be reached? why or why not ? The goal of using different organic farming methods is to grow g

38、ood food while avoiding damage to the environment or to peoples health. 2. Match the main ideas(A-D) below with the paragraphs. Then complete the sentences in the table. paragraphMain ideaDetail 1-2D bacteria and insects prohibited damage they cause grow too fast nutrition 3 A natural waste from animals 4c change the kind of crops every year different depths 5 Bdemand for food around the world Homework