Usinglanguage高一英语必修4第2单元.ppt

人教课标 高一 必修 4 Unit 2,Unit 2 Working the land,Using Language,What is the substance we put on the soil which makes crops grow? It is fertilizer.,How many kinds of fertilizers do farmers use? There are two kinds. They are chemical fertilizers and natural ones.,Which kind do farmers use when they are doing organic farming? Do you know about organic farming?,ORGANIC FARMING Organic farming is simply farming without using any chemicals.,Scan the passage and get the main idea of it.,Chemical fertilizers can cause many problems, so organic farming is becoming more popular.,1. Why are chemical fertilizers so popular in farming today?,Read the passage and answer the following questions.,They are a great way to stop crop disease and increase production.,2. What problems can be caused by using chemical fertilizers?,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 health by building up in their bodies and leading to cancer or other illnesses.,3. What is organic farming?,Organic farming means growing crops without using any chemicals.,4. What is the main reason for using organic farming methods?,The main reason for using organic farming methods is to grow good food and to avoid damaging the environment or peoples health.,Read the passage carefully and fill in the blanks.,production,bacteria and pests,nutrition,Goal,grass,natural,the kind of crop,different levels,In what condition do you think green food grow?,dirty air dirty water supplies in industrial areas many chemical fertilizers,clean, fresh air clean water supplies away from industrial areas free of chemical fertilizers,Project,Persuade farmers to grow the crops by organic farming with the knowledge learnt.,What is organic farming? What fertilizer should they use? Why? How to plant the different crops? .,1. Many of these chemicals can lead to cancer . lead to 用法 寓词于境 阅读下列句子，注意lead to的意思和用法。 1) His carelessness led to the accident. 2) This test is obviously bad because it leads to incorrect learning. 3) Too much work and too little rest often leads to illness.,Language points,自我归纳 lead to意为“_”, 后多跟名词或代词。,导致、造成(后果),联想 result in引起(某种结果)、使获得(某种成果)、结果。如： The accident resulted in two deaths. result from由造成、因而产生。如： Sickness sometimes results from eating too much.,即学即练 用lead to的适当形式完成句子。 1. Students should always remember that hard work is the main way which _ success. 2. The bad weather _ a terrible accident a few days ago.,led to,leads to,2. They focus on keeping their soil rich and free of disease. focus用法 根据语境推断focus在下列句子中的含义, 并从a-d中找出与每句话中的focus相符合的英文释义。,1. The focus of the meeting changed from population growth to the education of women. 2. Bring the object into focus if you want a clear photograph. 3. She tried to focus her mind on her work. 4. She turned the camera and focused on Martins face. a. the thing, person, situation, etc. that people pay special attention to b. a point or distance at which the outline of an object is clearly seen by the eye or through a lens c. to point a camera at something, and change the controls slightly so that you can see that thing clearly d. to give special attention to one particular person or thing, or to make people do this,c,a,b,d,focus n. 意为“焦点、中心点”; v. 意为“集中、聚焦” 常构成短语 focus on, 意为“集中(注意力、精力等)于”。 翻译下列句子。 1. Because of his strange clothes, he immediately became the focus of attention when he entered the office.,由于他的奇装异服, 所以一走进办公 室他便成了大家注意的焦点。,2. Focus your camera on those trees. 3. Im so tired that I cant focus on anything today.,把照相机的焦点集中在那些树上。 今天我太累了, 精神集中不起来。,3. This also keeps the air, soil, water and crops free from chemicals. keep free from “远离”或“避免”,keep free from emotional reactions 避免激动的反应 keep free from restrictions 避免受到限制,4. Crops such as peas or soybeans put important minerals back into the soil, making it ready for crops such as wheat or corn that need rich and fertile soil.,分析 本句结构比较复杂。其主干结构为: 主句(Crops put important minerals back into the soil) + 状语(making it ready for crops)。 状语中又包含“make + it + 形容词”结构和由that引导的定语从句(that need rich and fertile soil)。,5. Some organic farmers prefer planting grass between crops to prevent wind or water from carrying away the soil, and then leaving it in the ground to become a natural fertilizer for the next years crop. 分析 本句的主干结构是一个简单句, 其结构是: 主语(farmers) + 谓语(prefer) + 并列宾语(planting . + leaving .)。,其中between crops和i