高中英语人教版版必修4 Unit 2　Working the land Using language课件 (共21张PPT)

课件21张PPT。Chemical or Organic Farming?Book4 Unit 2 Working the land
Using languagenationality [?n????n?l?ti] n. 国籍
occupation [??kju?pe??n] n. 工作；职业；占领
personality [?p?:s??n?l?ti] n. 性格；个性；人格
confuse [k?n'fju:z] vt. 使迷惑；使为难
regret [r?'ɡret] vt. 遗憾；惋惜
n. 遗憾；懊悔
chemical [?kem?kl] adj. 化学的；关于化学的
organic [?:?g?n?k] adj. 有机的；器官的；组织的
fertile ['f?:ta?l] adj. 肥沃的；富饶的
fertilizer [?f?:t?la?z?(r)] n. 肥料；化肥
production [pr??d?k?n] n. 生产；制造
bacteria [b?k't??r??] n. (bacterium的复数形式) 细菌
pest [pest] n. 害虫；害兽；害鸟
build up 逐渐增强；建立；开发
lead to 导致；造成（后果）
nutrition [nju?tr??n] n. 营养；滋养；食物
mineral ['m?n?r?l] n. 矿物；矿石
discovery [d?'sk?v?r?] n. 发现；发觉
focus ['f??k?s] n. 焦点；中心点
vt. 集中；聚集
focus on 集中（注意力、精力等）于
soil [s??l] n. 土壤
reduce [r?'dju:s] vt. 减少；减缩
keep … free from/of 使……免受（影响；伤害等）；使……不含（有害物）
soybean ['s??bi:n] n. (= soyabean) 大豆
root [ru:t] n. 根；根源
skim [sk?m] vt. 浏览；略读
underline [??nd?'la?n] vt. 画底线标出；强调
summary ['s?m?r?] n. 总结；摘要；概要
comment ['k?ment] n. 评论；议论
vi. & vt. 表达意见；作出评论
producer [pr??dju:s?(r)] n. 生产者；制片人
industrial [?n?d?stri?l] adj. 工业的；产业的
Food is the first necessity of the people.“民以食为天。”Step1 leading-in吃动物怕激素；吃植物怕毒素；
喝饮料怕色素；能吃什么，心里没数。
－－－全国人大代表金志国带到两会上的顺口溜 Why did he say so?
“民以食为天。”“民以食为忧。”Now, let’s see if you are a smart customer?As customers , what kind of food shall we buy?Which one do you prefer?ABWhy?AChemical fertilizers化肥BNatural fertilizersnatural waste
from animals and dead plantsIt’s a product of organic farming.It’s a product of chemical farming.BAFind the topic sentence of each paragraph.Para 1Para 2Para 3Para 4Long-term use of chemical fertilizers can cause damage to the land and people’s health.Problems caused by chemical fertilizers.Farmers and customers turn to organic farming.Organic farmers also use many other methods to keep the soil fertile.Chemical FarmingOrganic FarmingStep2 skimmingStep3 Careful readingchemical fertilizersa phenomenon(现象)？the reasons for it？
the result？Over the past half century, using chemical fertilizers has become very common in farming. Many farmers welcomed them as a great way to stop crop disease and increase production. Recently, however, scientists have found that long-term use of these fertilizers can cause damage to the land and, even more dangerous, to people’s health. 动名词做主语do damage to 对…造成损害
damage sthListen to the tape carefully and find out the answersPara2:What are some of the problems caused by chemical fertilizers? landbacteria and pests和cancer导致 造成洗掉minerals另外nutrition逐渐增强随着时间的推移Tomato with a strawberry heart? 1. What is organic farming?


2. What kind of fertilizer do organic farmers use? Why?
Para 3. Farmers and customers turn to organic farming.
Organic farming is simply farming without using any chemicals. They focus on keeping their soil rich and free of disease. A healthy soil reduces disease and helps crops grow strong and healthy.They prefer using natural waste from animals as fertilizer. They feel that this makes the soil in their fields richer in minerals and so more fertile. This also keeps the air, soil, water and crops free from chemicals.Para4 Organic farmers also use many other methods to keep the soil fertile.每隔几年minerals使…做好准备surfacerootsgrass The methods to keep the soil fertile：
1 use natural waste from animals as fertilizer.
2 change the kind of crop in each field .
3 plant crops to use different levels of soil.
4 plant grass between crops to prevent … The same goal : ________________________
______________________________________
______________________________ to grow good food and avoid damaging the environment or people’s health.避免做某事Useful Expressions 1. 对……造成损害
2. 洗掉
3. 逐渐增强, 建立
4. 随着时间的推移
5. 导致; 造成
6. 另外，除此之外
7. 转向，求助于
8. 集中(注意力、精力)于
9. 使……富含……
10.使……免受(影响);
11. 防止，阻止……
12. 避免……cause damage to…
wash off
build up
over time
lead to…
in addition
turn to…
focus on…
make… rich in…
keep…free from/of…
prevent…from…
avoid doing sth. Summary In recent days, scientists have discovered that using________ fertilizers for a long time can _________________ the land and also people's health. There are several __________ caused by chemical fertilizers. They damage the land, stay in the water for a long time which can________ in people’s bodies and ________ many illnesses. ________ farming is becoming more popular with some farmers. Organic farming does not use any chemicals and _________ keeping the soil rich. This also ______ the air and crops ___________ chemicals. There are many organic farming_________ for making the land healthy and productive. All of these methods try to produce good food and to keep the environment and people’s health.
chemicalproblemscause damage to build uplead tokeepmethodsfocus onOrganicfree fromhttp://www.ppthi-hoo.com.remember language points in Using Language part and finish the exercises.
Thank you.