新课标高中英语第四册unit2课件

1、 Unit 2Working the land l1. Learn some language points：build up,-ing used as adverbial .l2.Combine the independent learning with the group discussionl3.Knowing the advantages of the organic farming Learning & teaching aims: Check the key words and phrases6.farming_7.导致导致;造成造成(后果后果)_8.逐渐增强逐渐增强,建立

2、建立_9.集中集中(注意力注意力)_10.使使免受免受(影响影响)_lead tobuild upfocus onkeep .free fromn.耕作耕作,农事农事1.fertilizer _2. bacteria_3.pest_4.nutrition _5.mineral _n.化肥化肥n.细菌细菌n.害虫害虫n.营养营养n.矿物，矿石矿物，矿石If you are a landowner, you want to grow some kinds of crops, what will you do?Lets go to the farm! Step 1: warming up Step

3、1: warming upFirst, buy or select the seeds from the store.Second, we need to plough(犁田） or turn over the soil.Third , we sow（播种） the seeds in the soil.Finally, we can harvest our crops. to improve the output of the crops fertilizer fertilizer How many kinds of fertilizers do farmers use? chemical f

4、arming BetterBetter？ organic farmingChemical Or Organic Farming?ReadingTask 1 SkimmingTask 1 Skimming（3mins3mins）Match the main idea with the paragraphs.You need to do it by yourself.Long-term use of chemical fertilizers can cause damage to the land and peoples health.Problems caused by chemical fer

5、tilizers.P1.P2.Farmers and customers turn to organic farming.Other methods to keep the soil fertile. P3.P4.Part one introduce the chemical farming ,the rest introduce the organic oneTask Task 2 Careful reading2 Careful readingQuestions:（6mins）1.Find and write down the methods and advantages of organ

6、ic farming (form)2.What problem can be caused by using chemical fertilizers?Organic farming Part 2make -richer in minerals and so more fertile and keep - free of chemicals.put -back into-,making it ready for other cropsuse different levels of soilprevent-from-and become a natural fertilizer1. Damage

7、 the land by killing the helpful bacteria and pests as well as the harmful ones.2. Affect crops ,animals and human.They can lead to cancer or other illness.3. Food grown with chemical fertilizers look beautiful, but inside there is usually more water than vitamins and minerals.The problems of chemic

8、al fertilizers Language points1. These chemicals in the food supply build up in peoples bodies over time.(para2)解析解析：build up 逐渐逐渐增强增强; 建立；开发建立；开发 e.g.Practising Chinese Kungfu can not only build up ones strength,but also develop ones character. It is easier to pull down than to build up. 拆房容易盖房难。拆房

9、容易盖房难。 2. Crops put important minerals back into the soil, making it ready for crops that need rich and fertile soil. (para4)解析：现在分词做结果状语往往表示正常出现的，自然而然的或意料之中的结果， 一般位于句末，其前有逗号隔开，有时为了突出结果之意可在分词前加副词thus, 常译为“因而，因此” e.g.They were caught in a traffic jam, thus causing the delay.区区分：分：动词不定式单独作结果状语，动词不定式单独

10、作结果状语，通常表示通常表示偶然的，出乎意料偶然的，出乎意料的结果，的结果，有时为了强调这种意外的结果，可在有时为了强调这种意外的结果，可在不定式前加不定式前加only, 译为译为“（结（结果）果）却却 e.g.She ran to the station only to find (that) the train have left. 她跑到火车站，但火车却开走了。她跑到火车站，但火车却开走了。 导练导练： 1. The news shocked the public, _ （lead）to great concern about students safety at school. 2.

11、He hurried to the cinema only _(find) the film had been on.leadingto find3.A healthy soil reduces disease and helps crops grow strong and healthy.(para3) reduce :v,减少；减少； 使处于，使成为（多用于被使处于，使成为（多用于被动）动）e.g. The poor woman is reduced to begging. 那个可怜的女人已经沦落到乞讨的地步。那个可怜的女人已经沦落到乞讨的地步。导练：Many measures have been