chemical-or-organic-farming.ppt

1、Chemical or Organic Farming (reading 2),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,Lead in,In this unit we have learnt about a great man, do you still remember who he is? What is his achievement? Can you think of other ways to increase our crop harvest?,chemical fertilizers natural fertilizers,1. What is organic farming? 2. What is the goal of using organi

3、c farming methods?,Scanning,Farming without using chemicals.,To grow good food and avoid damaging the environment or peoples health.,Long-term use of chemical fertilizers can cause damage to the land and peoples health.,Farmers and customers turn to organic farming.,Other methods to keep the soil fe

4、rtile.,Skimming,Problems caused by chemical fertilizers,Main idea,P1.,P2.,P3.,P4.,Read the text and fill in the blanks.,production,Careful-reading,bacteria and pests,nutrition,Goal,grass,natural,the kind of crop,different levels,Change crops every few years,Corn ,wheat,Peas soybeans,Put the minerals

5、 back into the soil, making it rich and healthy,Crops that use the surface of the soil (peanuts),Crops that need a deeper level of soil (root vegetable),Make sure that what is left in the ground after harvesting becomes a natural fertilizer for the next years crop,ORGANIC FARMING,Structure of the te

6、xt,I using chemical fertilizers for a long time can hurt the land and also peoples health II Problem caused by chemical fertilizers,1. Damage the land by killing the helpful bacteria and pests as well as the harmful ones,2. Lead to cancer or other illness.,3. Food grown with chemical fertilizers loo

7、k beautiful, but inside there is usually more water than vitamins and minerals., Organic farming is becoming more popular with some farmers and many customers after these discoveries came out. IV Other methods to keep the soil fertile.,Expressions,1.化肥 2.对造成损害 3.洗掉某物 4.导致;造成(后果);通往 5.逐渐增强,建立 6.另外(还有

8、) 7.使免受(影响); 使不含(有害物) 8.集中(注意力、精力)于 9.每隔几年 10.避免做,chemical fertilizers cause/do damage to wash off lead to bulid up in addition (to) keepfree from/of focus on every few years avoid doing,1.supply. 1) 用作名词时： a) 指“供给;供应”等,其反义词为demand (需求)。 supply and demand 供与求 be in short supply 供应缺乏,供应不足 food supply

9、 食物供应 water supply 供水,b) 当“供应品;生活用品;补给品”等,常用复数supplies。 military supplies 军需品 household supplies 家庭用品 medical supplies 医用品,2) 用作动词时,指“供给,提供,备办”等, supply sb. (with) sth , supply sth. to /for sb. - They supplied food to/for them. 他们供给他食物。 - The library is well supplied with books. 图书馆备有充足的书籍。,比较 suppl

10、y, provide 和 afford supply向群众、市场、城市、工厂等 供应物品。 provide 主要指为某人、某物供应物 品, 尤其指生活必需品。 afford 指为一定的目的而提供所需要 的东西。,They provided the refugees food and medicine. 他们为难民提供食品和药品。 These efforts afforded us useful experience. 这些努力使我们得到一些有益的经验。 All the rooms are _ with electric lights. A. supplied B. given C. offer

11、ed D. burnt (2005 上海）,即学即练 用lead to的适当形式完成句子。 1. Students should always remember that hard work is the main way which _ success. 2. The bad weather _ a terrible accident a few days ago.,led to,leads to,2.lead to,3. focus用法 猜一猜 根据语境推断focus在下列句子中的含义, 并从a-d中找出与每句话中的focus相符合的英文释义。,1. The focus of the me

12、eting changed from population growth to the education of women. 2. Bring the object into focus if you want a clear photograph. 3. She tried to focus her mind on her work. 4. She turned the camera and focused on Martins face. a. the thing, person, situation, etc. that people pay special attention to

13、b. a point or distance at which the outline of an object is clearly seen by the eye or through a lens c. to point a camera at something, and change the controls slightly so that you can see that thing clearly d. to give special attention to one particular person or thing, or to make people do this,c

14、,a,b,d,归纳总结 focus作名词, 意为“焦点、中心点”; 作动词, 意为“集中、聚焦”, 常构成短语focus on, 意为“集中(注意力、精力等)于”。,4. keep free from “远离”或“避免”,keep free from emotional reactions 避免激动的反应 keep free from restrictions 避免受到限制,1. Crops such as peas or soybeans put important minerals back into the soil, making it ready for crops such as

15、wheat or corn that need rich and fertile soil.,分析 本句结构比较复杂。其主干结构为: 主句(Crops put important minerals back into the soil) + 状语(making it ready for crops)。 状语中又包含“make + it + 形容词”结构和由that引导的定语从句(that need rich and fertile soil)。,2. Some organic farmers prefer planting grass between crops to prevent wind

16、 or water from carrying away the soil, and then leaving it in the ground to become a natural fertilizer for the next years crop. 分析 本句的主干结构是一个简单句, 其结构是: 主语(farmers) + 谓语(prefer) + 并列宾语(planting . + leaving .)。,其中between crops和in the ground作地点状语。 两个宾语后面又分别带有一个不定式作目的状语（to prevent wind or water from ca

17、rrying away the soil和to become a natural fertilizer for the next years crop）。,Exercises,cause/do damage to, wash off, lead to, bulid up, in addition(to), keepfree from/of, focus on, avoid doing,1. His mistakes _ his failure. 2. These chemicals in the food supply_ in peoples bodies over time. 3. 4. P

18、lease _ your mind_ the following problem. 5. Children should _ violence.,led to,bulid up,focus,on,All roads _ Rome.,lead to,be kept free from,cause/do damage to, wash off, lead to, bulid up, in addition(to), keepfree from/of, focus on, avoid doing,6. He likes basketball._,he likes football. He likes basketball _foo