Working the land课件

• 1．build up逐渐增强；来自百度文库立；开发
• • • These chemicals in the food supply
build up in people's bodies over time.
食 物中的这些化学物质会在人体中逐渐
积累。
l'm very glad to see that your
Unit 2 Working the land ion Ⅲ Using Language 课件（人教版必修4，课标通用
• Ⅰ.阅读理解 • Using chemical fertilizers is popular because it can stop crop disease and increase__1__，but longterm use of these fertilizers can cause damage to the land and even to people's health.Organic farming is to grow crops with natural but not__2__fertilizers.Organic farmers __3__keeping their soil rich and __4__disease.They prefer using natural waste from animals as fertilizers.They
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三、教材佳句背诵 1 ． Recently ， however ， scientists___________that longterm use of these fertilizers can cause damage to the land and，even more dangerous，to people's health. 然 而，最近科学家发现长期使用这些肥 料会造成土地受损，甚至更危险的是，会 对人们的健康造成危害。 2 ． With these discoveries ， some farmers and many customers __________________organic farming.
vocabulary is gradually building up. • 看到你的词汇量在逐渐增加，我很高兴。
• 【即境活用】 • 写出下列各句中画线部分的汉语意思 • ①To learn a language well you must build up a useful vocabulary. • ( ) • ②Promote physical culture and build up the people's health. • ( ) • 答案 ①逐渐积累有用的词汇 ②增强人 民体质
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二、重点短语探究 1．build________ 逐渐增强；建立；开发 2．lead________ 导致；造成(后果) 3．focus________ 集中(注意力、精力等) 于 4．keep...free________ 使……免受(影响、 伤害等)； 使……不含(有害物) 5 ． cause damage________ 对 …… 造成 损害 6．________ addition 此外；另外
• 2．lead to导致，造成(后果)；通往…… • Many of these chemicals can lead to cancer or other illnesses. • 这 些化学物质中有很多会引起癌症或其 他疾病。 • Too much work and too little rest can lead to illness. • 过量的工作和过少的休息会引发疾病。 • The road leads to the foot of the hill. • 这条路通往山脚下。 • 名师点睛： lead to 中的 to 是介词，后面
• 答 案 1.chemical ； chemistry 2.production；produce • 3 ． discover ； discovery 4.reduce ； reduction 5.nutrition • 6．underline 7.summary 8.comment
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• 3 ． A healthy soil________disease and helps crops__________. • 肥沃的土壤减少了病虫害并且有助于农作 物的茁壮成长。 • 4．This also________the air，soil，water and crops________ chemicals. • 这有助于空气、土壤、水和农作物免受化 学物质的污染。 • 答案 1.have been finding 2.are beginning to turn to
• Ⅱ.教材研读 • 一、重点单词熟记 • 1 ． ________(adj.) 化 学 的 ； 关 于 化 学 的 →________(n.)化学 • 2 ． ________(n.) 生 产 ； 制 造 →________(v.)生产 • 3 ． ________(vt.) 发现→ ________(n.) 发现； 发觉 • 4 ． ________(vt.) 减 少 ； 减 缩 →________(n.)减少 • 5．________(n.)营养；滋养；食物
• Organic farmers also use many other methods to keep the soil fertile.They often change the kind of crop in each field__7__， or plant crops to use different__8__ of soil， or plant grass between crops to prevent wind or water from __9__ the soil.However， these methods have the same goal ： to grow good food and avoid damaging the __10__ or people's health. • 答案 1.production 2.chemical 3.focus on 4.free of/from 5.richer in 6.fertile 7.every few years 8.levels