高中英語必修四-unit2-chemical-or-organic-farming-？

1、Chemical Or Organic Farming?Unit 2 Working the landWords previewchemicalproductionbacteriapestnutritionmineraldiscoveryadj. 化學(xué)的化學(xué)的; 關(guān)于化學(xué)的關(guān)于化學(xué)的n. 生產(chǎn)生產(chǎn); 制造制造n. 細菌細菌n. 害蟲害蟲; 害獸害獸; 害鳥害鳥n. 營養(yǎng)營養(yǎng); 滋養(yǎng)滋養(yǎng); 食物食物n. 礦物礦物; 礦石礦石n. 發(fā)現(xiàn)發(fā)現(xiàn); 發(fā)覺發(fā)覺focussoilreducerootskim underlinesummarycommentn. 焦點焦點; 中心點中心點vt. 集中集中; 聚焦

2、聚焦n. 土壤土壤vt. 減少減少; 減縮減縮n. 根根; 根源根源vt. 瀏覽瀏覽; 略讀略讀vt. 畫底線標出畫底線標出; 強調(diào)強調(diào)n. 總結(jié)總結(jié); 摘要摘要; 概要概要n. 評論評論; 議論議論vi.& vt.表達意見表達意見;做出評論做出評論 Expressions preview build up lead to focus on keep free from/ofin addition (to)逐漸增強逐漸增強; 建立建立; 開發(fā)開發(fā)導(dǎo)致導(dǎo)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(影響影響, 傷害等傷害等)；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(鐳鐳) 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. 年輕人應(yīng)該遠離毒品。年輕人應(yīng)該遠離毒品。

11、The young should be kept free from drug.2. 努力學(xué)習(xí)就可以積累大量的知識。努力學(xué)習(xí)就可以積累大量的知識。Studying hard can build up a great deal of knowledge .3. 艱苦的工作條件艱苦的工作條件(condition)能磨練人的性格能磨練人的性格(character)。Hard working conditions build up character. 完成下列句子：完成下列句子：4. 抽煙可能導(dǎo)致肺癌。抽煙可能導(dǎo)致肺癌。 Smoking can lead to lung cancer. Watchi

12、ng TV too much leads to blindness.5. 看電視太多會看電視太多會 導(dǎo)致失明。導(dǎo)致失明。6. 要是把注意力集中在你的學(xué)習(xí)上，你一定要是把注意力集中在你的學(xué)習(xí)上，你一定會取得進步。會取得進步。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（闡明）（闡明）comparison conclusionThe type of the article is_Exposition（說明文）（說明文）Step 6 The structure of this

15、 passageStep 7 中山報社征文中山報社征文: “綠色行動進行中綠色行動進行中”征寫與環(huán)保相關(guān)的英征寫與環(huán)保相關(guān)的英文文章文文章. 導(dǎo)言：古往今來，地球母親用甘甜的乳汁哺育了無數(shù)代子導(dǎo)言：古往今來，地球母親用甘甜的乳汁哺育了無數(shù)代子孫。從前的她是那么的美麗。可現(xiàn)在，卻被人類為了自身孫。從前的她是那么的美麗?？涩F(xiàn)在，卻被人類為了自身的利益，將她折磨得面目全非了。人類只有一個地球；而的利益，將她折磨得面目全非了。人類只有一個地球；而地球正面臨著嚴峻的環(huán)境危機。地球正面臨著嚴峻的環(huán)境危機?！熬染鹊厍蚓染鹊厍颉币殉蔀槭澜缫殉蔀槭澜绺鲊嗣褡顝娏业暮袈?。我們都喜歡藍藍的天空，清澈的各國人民最強

16、烈的呼聲。我們都喜歡藍藍的天空，清澈的河流，新鮮的空氣，渴望處處是鳥語花香，希望我們的家河流，新鮮的空氣，渴望處處是鳥語花香，希望我們的家園潔凈美麗。要想實現(xiàn)這些我們中山人就應(yīng)該開始行動了。園潔凈美麗。要想實現(xiàn)這些我們中山人就應(yīng)該開始行動了。以以“Plastic or Cloth Bags?”為題寫一篇說明文。為題寫一篇說明文。(請請模模仿仿這篇文章的篇章結(jié)構(gòu)和句子結(jié)構(gòu)這篇文章的篇章結(jié)構(gòu)和句子結(jié)構(gòu))寫作內(nèi)容：使用塑料袋的害處有：寫作內(nèi)容：使用塑料袋的害處有：1.“白色污染白色污染”的主要來源；的主要來源；2.不可回收再利用；不可回收再利用；3.燃燒污染空氣；影響健康。燃燒污染空氣；影響健康。4

17、.埋掉埋掉(200年不會溶解年不會溶解)污染土壤和地下水。污染土壤和地下水。使用環(huán)保袋的好處有：使用環(huán)保袋的好處有： 1.使用完的袋子容易處理；使用完的袋子容易處理； 3.可以多次重復(fù)利用；可以多次重復(fù)利用； 4.價格低廉，易于推廣。價格低廉，易于推廣。 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