高中英语人教版必修四教学案Unit 2 Section 4.docx

1、高中英语人教版必修四教学案Unit 2 Section 4Read the passage quickly and complete the following questions1Match each part with its main ideaPart 1 (Para1) AFarmers and customers turn to organic farming and how farmerskeep their soil richPart 2 (Para2) BScientists have found that chemical fertilizers cause damageto

2、 the land and peoples healthPart 3 (Paras3&4) CSome of the problems caused by chemical fertilizers答案：Part 1BPart 2CPart 3A2What does the passage tell us?Since chemical fertilizers have caused damage,_farmers have turned to organic_farming,_using natural_waste to keep the soil richRead the passage ca

3、refully and choose the best answers1From the passage, we can see organic farmers are those who _Agrow crops with chemical fertilizersBgrow crops with natural fertilizersCproduce organic fertilizersDcare for the environment2From the fourth paragraph, we know that _Aits not good to plant grass between

4、 cropsBpeanuts use the grounds surfaceCpeas and soybeans should be grown together with corn and wheatDvegetables that put down deep roots are harmful to the soil3According to the text, which of the following is NOT the problem caused by chemical fertilizers?ACrop diseases can be stoppedBChemicals st

5、ay in the ground and underground water for a long timeCThe helpful bacteria and pests are killed as well as the harmful onesDMany of these chemicals are dangerous to peoples health答案：13BBA单词拼写1The number of people suffering from heart disease will be greatly reduced (减少) if they are persuaded to eat

6、 more fruit and vegetables2The focus (焦点) of public health is prevention and protection rather than treatment3The spokesman refused to comment (评论) on the matter4All the mistakes in the exam have been underlined (画底线标出) in red ink5Bacteria (细菌) are very small living things, some of which cause illne

7、ss or disease6Good nutrition (营养) is essential if patients are to make a quick recovery7It is important for you to skim (浏览) through the text拓展词汇1confusevt使迷惑；使为难confused adj困惑的；烦恼的confusing adj令人困惑的confusion n困惑；混乱2regretvt遗憾；惋惜 n遗憾；懊悔regretful adj遗憾的；后悔的regretfully adv遗憾地；痛惜地3chemicaladj化学的；关于化学的c

8、hemistry n化学4mineraln矿物；矿石mine n矿；矿山5productionn生产；制造produce vt生产；制造producer n生产者；制片人6discoveryn发现；发觉discover vt发现discoverer n发现者7summaryn总结；摘要；概要summarize vt总结；概括巧记单词例词规律派生词regretfulvfuladjconfusedv(e)dadjdiscoveryvyn补全短语1(be) in need of需要2cause damage to给造成损害3wash off将洗掉；洗净4build up逐渐增强；建立；开发5lead

9、 to导致；造成(后果)6in addition 另外7focus on集中(注意力、精力等)于8keep free from/of使免受(影响、伤害等)；使不含(有害物)1教材原句Recently, however, scientists have been finding that longterm use of these fertilizers can cause damage to the land and, even more dangerous, to peoples health然而，最近科学家发现长期使用这些肥料会对土地造成损害，甚至更危险的是，会对人们的健康造成危害。句型点

10、拨现在完成进行时表示从过去发生的谓语动作一直持续到现在，强调动作的持续性。佳句赏析The Grade Two classes have been observing the plants around the school and finding the animals that live there二年级各班的学生在学校周边观察植物和寻找小动物。2教材原句Crops such as peas or soybeans put important minerals back into the soil, making it ready for crops such as wheat or cor

11、n that need rich and fertile soil像豌豆或大豆这样的农作物能使土壤重新富含重要的矿物质，这为种植需要肥沃土壤的农作物，如小麦和玉米等做好了准备。句型点拨现在分词短语在句中作结果状语。佳句赏析(2013天津高考满分作文) On the other hand, I will help set up the English corner, providing us students a platform to practice our oral English另一方面，我将帮着建立英语角，提供给我们学生一个练习英语口语的平台。 CHEMICAL OR ORGANIC

12、FARMING?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 been finding that longterm use of these fertilizers can cause damage to the land

13、and, even more dangerous, to peoples healthWhat are some of the problems caused by chemical fertilizers? First, they damage the land by killing the helpful bacteria and pests as well as the harmful ones Chemicals also stay in the ground and underground water for a long time This affects crops and, t

14、herefore, animals and humans, since chemicals get inside the crops and cannot just be washed off These chemicals in the food supply build up in peoples bodies over time Many of these chemicals can lead to cancer or other illnesses In addition, fruit, vegetables and other food grown with chemical fer

15、tilizers usually grow too fast to be full of much nutrition They may look beautiful, but inside there is usually more water than vitamins and mineralsWith these discoveries, some farmers and many customers are beginning to 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 help