Unit2WorkingthelandUsinglanguage2.ppt

1、Unit 2 Working the land Using language,chemical production bacteria pest nutrition mineral,adj. 化学的；关于化学的 n. 生产；制造 n. 细菌 n. 害虫；害兽；害鸟 n. 营养；滋养；食物 n. 矿物；矿石,discovery focus soil reduce root,n. 发现；发觉 n. 焦点；中心点 vt. 集中；聚焦 n. 土壤 vt. 减少；减缩 n. 根；根源,skim underline summary comment,vt. 浏览；略读 vt. 画底线标出；强调 n. 总结；

2、摘要；概要 n. 评论；议论 vi. 做出评论,build up lead to focus on keep free from/of,逐渐增强; 建立; 开发 导致; 造成 (后果) 集中 (注意力，精力等) 于 使免受(影响，伤害等)； 使不含(有害物),Organic Farming,What are genetically-modified foods? The term GM foods or GMOs (genetically-modified organisms) is most commonly used to refer to crop plants created for

3、human or animal consumption using the latest molecular biology techniques.,What are some of the advantages of GM foods? The world population has topped 6 billion people and is predicted to double in the next 50 years. Ensuring an adequate food supply for this booming population is going to be a majo

4、r challenge in the years to come. GM foods promise to meet this need in a number of ways:,1).pest resistance 2).disease resistance 3).cold tolerance 4).drought tolerance/salinity tolerance 5).nutrition,What are some of the criticisms against GM foods? Most concerns about GM foods fall into three cat

5、egories: environmental hazards, human health risks, and economic concerns.,Read and answer:,What is the main idea of this passage?,This passage tells us something about organic farming. It means growing crops without chemical fertilizers which damage the soil. The organic farmers keep the soilrich a

6、nd healthy in several ways.,1 Why are chemical fertilizers so popular in farming today? 2 What problems can be caused by using chemical fertilizers? 3 What is organic farming? 4 What is the main reason for using organic farming methods?,Read the passage and answer the following questions.,1 Why are

7、chemical fertilizers so popular in farming today?,They are a great way to stop crop disease and increase production.,2 What problems can be caused by using chemical fertilizers?,They can damage the land by killing helpful bacteria and pets and by staying in the ground and underground water for a lon

8、g time, They damage peoples health by building up in their bodies and leading to cancer or other illnesses.,3 What is organic farming? 4 What is the main reason for using organic farming methods?,Organic farming means growing crops without using any chemicals.,The main reason for using organic farmi

9、ng methods is to grow good food and to avoid damaging the environment or peoples health.,Find and write down the methods and advantages in the passage.,Language points,1 These chemicals in the food supply build up in peoples bodies over time. build up 增强; 建立；开发 Hard working conditions build up chara

10、cter. 艰苦的工作条件能磨练人的性格。,2 Many of these chemicals can lead to cancer or other illnesses. lead to: 导致；造成 Too much work and too little rest often lead to illness. 过量的工作和过少的休息会引起疾病。 All roads lead to Rome. 条条大道通罗马。,3 They focus on keeping their soil rich and free of disease. focus on:集中(注意力，精力等）于 You sho

11、uld focus your attention on your work.把注意力集中在你的工作上。 Olympus: Focus on life.奥林巴斯：瞄准生活。,4 This also keeps the air, soil, water and crops free from chemicals. keeps free from /of: 使免受（影 响，伤害登）；使不含（有害物） keep from: 阻止; 妨碍 I hope you will keep from doing anything rash. 我希望你不要做出任何鲁莽的事情来。,Listening,chemical

12、 fertilizer,cow dung,用化学肥料和有机肥料的区别:,The possible bad effects of chemical fertilizers on the fruit and vegetables that we eat today.,As you listen to this dialogue, keep in mind what you have just read about chemical fertilizers. What is the main topic of the conversation?,Listen to the dialogue a se

13、cond time. Decide if the following statements are true or false, according to the conversation. Give your reasons.,1 Paul thinks that Carrie is not telling him the truth. 2 Using chemical fertilizers always makes vegetables empty inside.,True,False,3 Todays fruit is not as healthy for people as frui

14、t fifty years ago. 4 Eating more vegetables might not always be good for us. 5 All of todays vegetables look healthy but in fact are not.,False,True,True,Listening text,WHATS WRONG WITH THE VEGETABLES?,Girl: Hey, Paul, listen to this a magazine article about a farmer who used too much chemical ferti

15、lizer on his fields. When his vegetables were picked, they were all found to be empty!,BOY: Empty? Youre joking, Carrie that cant be true! Girl: I didnt believe it either! This article says this can happen sometimes with vegetables like cucumbers, carrots and pumpkins. This chemical fertilizer makes

16、 the vegetables grow fast to look big and beautiful, but theyre empty inside!,BOY: You know, Ive noticed that sometimes my mum buys carrots from the supermarket that have big holes down the center. I guess that must be from using chemical fertilizers! GIRL: Yeah, thats what the magazine says! The ma

17、in point of the article, though, isnt about holes in our vegetables.,Its talking about why the fruit and vegetables we eat today arent as nutritious as the ones our grandparents ate. BOY: What? My mum is always telling me to eat more vegetables, because theyre good for me! GIRL: Yeah, I know my moth

18、er says that same thing! And its true -,they are good for us but the problem is that they arent healthy enough! All these chemical fertilizers they kill off both the bad and the good things in the ground. The ground doesnt have enough vitamins and minerals any more to help crops grow healthy.,BOY: So if o