高中英语必修四-unit2-chemical-or-organic-farming-？

1、Chemical Or Organic Farming?Unit 2 Working the landWords previewchemicalproductionbacteriapestnutritionmineraldiscoveryadj. 化学的化学的; 关于化学的关于化学的n. 生产生产; 制造制造n. 细菌细菌n. 害虫害虫; 害兽害兽; 害鸟害鸟n. 营养营养; 滋养滋养; 食物食物n. 矿物矿物; 矿石矿石n. 发现发现; 发觉发觉focussoilreducerootskim underlinesummarycommentn. 焦点焦点; 中心点中心点vt. 集中集中; 聚焦

2、聚焦n. 土壤土壤vt. 减少减少; 减缩减缩n. 根根; 根源根源vt. 浏览浏览; 略读略读vt. 画底线标出画底线标出; 强调强调n. 总结总结; 摘要摘要; 概要概要n. 评论评论; 议论议论vi.& vt.表达意见表达意见;做出评论做出评论 Expressions preview build up lead to focus on keep free from/ofin addition (to)逐渐增强逐渐增强; 建立建立; 开发开发导致导致; 造成造成 (后果后果) 集中集中 (注意力注意力, 精力等精力等) 于于使使免受免受(影响影响, 伤害等伤害等)；使使不含不含(有

3、害物有害物) 此外此外1.The government has banned(禁止禁止) the use of _ weapons（武器）（武器）. chemical2. They have worked out a series of _ plans to increase agricultural output this duction3.Radium(镭镭) is one of the greatest _ during the nineteenth century. discoveries4. He always _ his mind on his lessons. f

4、ocuses5. The government should take measures to _ envrionment polution.reduceStep 2 Fill in the blanks using the words and expressions above.6. Read the passage and _ the topic of each paragraph. underline7. Youd better not _ untill you know the facts .comment8. We must do exercises every day to _ou

5、r bodies.build up9.Misunderstandings between friends may _ quarrels.lead to10. The students should _ themselves _ bad habits.keepfree fromChemical Or Organic Farming? Skim to find the topic sentence or main idea for each paragraph.Long-term use of chemical fertilizers can cause damage to the land an

6、d peoples health.Problems caused by chemical fertilizers Farmers and customers turn to organic farming. Other methods to keep the soil fertile.Para 1Para 2Para3para4Part1Part 2chemical farmingorganic farmingStructure:1. Why are chemical fertilizers so popular in farming today? Long-term use of chemi

7、cal fertilizers can cause damage to the land and , even more dangerous, to peoples health.Read Para 1 and answer the following questions.2. After the long-term use of chemical fertilizers, what have scientists found? Many farmers welcomed them as a great way to stop crop disease and increase product

8、ion.Chemical farmingproblemscause1. _ the landby_ the helpful _ and pests _harmful ones2._ crops, animals and humansby _ in the ground and underground water3._ cancer or other illnessesby_ in peoples bodies over time4. fruit, vegetables and other food_ less _by _ too fastdamageaffectlead tohavenutri

9、tionkillingbacteriaas well asstayingbuilding upgrowingOrganic farmingMethods advantages1. use _from animals as fertilizersmake richer in minerals and so more fertile and keep free of chemicals.2. change the kind of crop in each field _put back into ,making it ready for other crops3. plant different

10、crops with different rootsuse different levels of soil4. plant grass between crops and then _ it in the groundPrevent from and become a natural fertilizernatural wasteevery few yearsleaveThe same goal:_to grow good food and to avoid damaging the environment or peoples health. 1. 年轻人应该远离毒品。年轻人应该远离毒品。

11、The young should be kept free from drug.2. 努力学习就可以积累大量的知识。努力学习就可以积累大量的知识。Studying hard can build up a great deal of knowledge .3. 艰苦的工作条件艰苦的工作条件(condition)能磨练人的性格能磨练人的性格(character)。Hard working conditions build up character. 完成下列句子：完成下列句子：4. 抽烟可能导致肺癌。抽烟可能导致肺癌。 Smoking can lead to lung cancer. Watchi

12、ng TV too much leads to blindness.5. 看电视太多会看电视太多会 导致失明。导致失明。6. 要是把注意力集中在你的学习上，你一定要是把注意力集中在你的学习上，你一定会取得进步。会取得进步。If You focus your attention on your study , you must make progress. Organic farming has advantages. First of all, organic farmers focus on keeping the soil rich and free of disease. And wha

13、ts more, organic farming keeps the soil and crops free from chemicals. In order to increase the production, they change the kind of crop in each field every few years. Finally,some organic farmers prefer planting grass between crops to prevent wind or water from carrying away the soil. In a word, Or

14、ganic farming has the same goal :to grow good food and to avoid damaging the environment or peoples health. Retell Part 2Para1 Topic Para2 ProblemsPara3 AdvantagesPara4 Several methodsillustration（阐明）（阐明）comparison conclusionThe type of the article is_Exposition（说明文）（说明文）Step 6 The structure of this

15、 passageStep 7 中山报社征文中山报社征文: “绿色行动进行中绿色行动进行中”征写与环保相关的英征写与环保相关的英文文章文文章. 导言：古往今来，地球母亲用甘甜的乳汁哺育了无数代子导言：古往今来，地球母亲用甘甜的乳汁哺育了无数代子孙。从前的她是那么的美丽。可现在，却被人类为了自身孙。从前的她是那么的美丽。可现在，却被人类为了自身的利益，将她折磨得面目全非了。人类只有一个地球；而的利益，将她折磨得面目全非了。人类只有一个地球；而地球正面临着严峻的环境危机。地球正面临着严峻的环境危机。“救救地球救救地球”已成为世界已成为世界各国人民最强烈的呼声。我们都喜欢蓝蓝的天空，清澈的各国人民最强

16、烈的呼声。我们都喜欢蓝蓝的天空，清澈的河流，新鲜的空气，渴望处处是鸟语花香，希望我们的家河流，新鲜的空气，渴望处处是鸟语花香，希望我们的家园洁净美丽。要想实现这些我们中山人就应该开始行动了。园洁净美丽。要想实现这些我们中山人就应该开始行动了。以以“Plastic or Cloth Bags?”为题写一篇说明文。为题写一篇说明文。(请请模模仿仿这篇文章的篇章结构和句子结构这篇文章的篇章结构和句子结构)写作内容：使用塑料袋的害处有：写作内容：使用塑料袋的害处有：1.“白色污染白色污染”的主要来源；的主要来源；2.不可回收再利用；不可回收再利用；3.燃烧污染空气；影响健康。燃烧污染空气；影响健康。4

17、.埋掉埋掉(200年不会溶解年不会溶解)污染土壤和地下水。污染土壤和地下水。使用环保袋的好处有：使用环保袋的好处有： 1.使用完的袋子容易处理；使用完的袋子容易处理； 3.可以多次重复利用；可以多次重复利用； 4.价格低廉，易于推广。价格低廉，易于推广。 Over the past half century, have become very common . welcomed them as a way to . Recently, however, we have been finding that they can cause damage to , even , to peoples

18、health.What are some of the problems caused by ? First of all, And whats more, in addition, Last but not least , With these discoveries, are beginning to turn to .The following words and expressions may help you.Homework :Finish the writing . Over the past half century, plastic bags have become very

19、 common in our daily life. We welcomed them as a convenient way to carry goods. Recently, however, we have been finding that they can cause damage to the environment, even worse, to peoples health. What are some of the problems caused by plastic bags? First of all, people often leave plastic bags here and