高中英语Unit2Workingtheland教案4新人教版必修4

1、unit 2 working the landthe third period extensive readingteaching goals教学目标1. target language目标语言a.重点词语chemical, bacteria, pest, lead to, discovery, nutrition, keepb.重点句型 free from, rootwith these discoveries, some farmer and many customers are beginning to turn to organic farming.over the past half

2、 century, using chemical fertilizers has become very common in farming.2. ability goals能力目标enable ss to master themain ideaof thetextand know the ways of3. learning ability goals学能目标help ss learn how to enlarge the words and structures of the same topic.teaching important and difficult points教学重难点or

3、ganizing articles.1. how to grasp the main idea of the passage.2. how to grasp the words and phrases and be able to use them freely.teaching methods教学方法show questions, read fast, find the main ideas, and then read carefully and finishall the tasks.teaching aids教学准备a recorder and a projector.teaching

4、 procedures & ways教学过程与方法step leading in enjoy a beautiful song a quiz & fill blankst: morning, boys and girls! glad to see you! before learning, let us enjoy atheabout is it yes, about? song this is what song. beautifulagriculture .agriculture can provide us with food .can you tell me; do you have

5、healthy food everyday? is healthy food important to us?ss: yeah! glad to see you! yes, i think that the food we eat everyday is healthy food! i think healthy food is important to us all!(first,let students taste some delicious food and guess what the food are?)t: good job! really? first, let us have

6、 a quiz. i would like some students come here to taste the food in this plate and tell us the name of the food. remember, you need close your eyes before you taste the food.ss: ok.t: are they delicious? this food is green food that i brought from super market yesterday. ok, boys and girls! listen to

7、 me carefully! everybody knows that as peoples living condition improves, more and more people are concerned about whatthey eat. because more and more farmers use chemical fertilizer instead of naturalwaste from animals and they use poison to kill insects to protect their plants. sopeople now all wa

8、nt to eat green food which does no harm to their health. well, howdo you understand green food? do you know the advantages of green food? let us havea competition .two groups, the group which can get the highest marks will be thewinner, are you clear?ss: advantages of green food* taste delicious *gr

9、own in clean air *free of p pollution*rich in nutrition*do good to peoples health and the environmentt： well done! everyone. can you tell me which kind of farming makes green food?chemical or organic farming?t: great! you did a good job! well, let us read the text on p14 and know something about org

10、anic farming.step pre readingt:before reading the text, please look at the picture first and predict what thepassage about. then have free talks on what can you see in the picture?talland mountains field, green see can we agriculture. about be may picture thess:trees .we also can see some animals, s

11、uch as chickens, pigs, geese, and ducks and so on. not far away, a man is driving a tractor to plowing fields.t： excellent! now, before reading the passage, let read the bold word words in the text loudly.ss: chemical, productionstep fast readingt： let us read the text first and then finish the foll

12、owing questions after readingthe passage. you only have 3 minutes.questions:1. why are chemical fertilizers so popular in farming today?2. what problems can be caused by using chemical fertilizers?3. what is organic farming?4. what is the main reason for using organic farming methods? answers:1. the

13、y are a great way to stop crop disease and increase production.2. they can damage the land by killing helpful bacteria and pests and by staying in the ground and underground water for a long time. they damage peoples healthby building up in their bodies and leading to cancer or other illnesses.3. or

14、ganic farming means growing crops without using any chemicals.4. the main reason for using organic farming methods is to grow good food and to avoid damaging the environment or peoples health.t： wonderful! boys and girls!step intensive reading find the main idea and the topic sentence of each paragr

15、aph to know the structure of this passage. according to the main idea and the topic sentence of each paragraph, let students know how to write a summary.t： now, this time let us read the passage after the tape sentence by sentence. please pay attention to the pronunciation and pauses of each sentenc

16、e. then find out the main idea and topic sentence of each paragraph to know the structure of this passage.s begin. ok, letss:main idea of the passagechemical fertilizers can cause many problems, so organic farming is becoming morepopular.structure of the textparagraph 1: using chemical fertilizers f

17、or a long time can hurt the land and also peoples healthparagraph 2: problem caused by chemical fertilizers1. damage the land by killing the helpful bacteria and pests as well as the harmful ones2. lead to cancer or other illness.3. food grown with chemical fertilizers look beautiful, but inside the

18、re is usually more water than vitamins and minerals.paragraph 3: organic farming is becoming more popular with some farmers and manycustomers after these discoveries came out.paragraph 4: other methods to keep the soil fertile.step explanationshow the following practice on the screen.1. they focus o

19、n keeping their soil rich and free of disease. 考点 动词 -ing短语作介词的宾语。 考例 1 isnt it time you got down to _ the papers? (重庆 2006)a. markb. be markedc. being markedd. marking 点拨 get down to doingsth.开始着手干某事，to 在这个短语中是介词,后可跟动词 -ing形式、名词或代词。又因mark the papers“判试卷”与逻辑主语you 是主动关系，故排除选项c。2. 考例 2 according to a

20、recent u.s. survey, children spent up to 25 hours a week_ tv. (上海 2004)a. to watch b. to watchingc. watchingd. watch 点拨 spend time / money (in) doing sth.花费时间或金钱干某事。doing sth.作介词in的宾语。3. build up逐渐积聚 ; 增进，增强traffic on this road is building up. build up ones strength after an illness.4. lead to导致 ;通向往his mistakes led to his failure.this road leads to the railway station.5. keep free from“远离”或“避免”keep free from emot