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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 2 Working the land,Unit 2 Working the land,Task 1:Brainstorming,What will you think of when you see the word“,agriculture,”?,agriculture,Task 1:BrainstormingWhat will,farm,irrigation,food,crop,field,plants,plain,GMF,grain,farmer,fertilizer,seed,prairie,countryside,land,arable,land,agriculture,farmirrigationfoodcropfieldpla,wheat,corn,rice,soybean,cotton,broomcorn,peanut,wheatcornricesoybeancottonbroo,Terrace,Drought,Irrigated land,Greenhouse,TerraceDroughtIrrigated landGr,In the,first,picture:,*,Terraced fields.,In the,second,picture:,*,Dry barren farmland.,In the,third,picture:,*,Irrigated farmland.,In the,fourth,picture:,*,Greenhouses.,What are the differences?,Compare the old and the modern,ways of irrigation.,Natural,Climate,Controlled,Climate,in bad weather,crops lost,climate controlled,less damage,The landscape loses its natural beauty.,Only arable land can grow crops.,Greenhouses can be built almost everywhere.,The landscape is more beautiful.,If there is a power failure,you may lose crops.,In the first picture:*Terrac,What are genetically-modified foods?,The term GM foods or GMOs(genetically-modified organisms)is most commonly used to refer to crop plants created for human or animal consumption using the latest molecular biology techniques.These plants have been modified in the laboratory to enhance desired traits such as increased resistance to herbicides or improved nutritional content very rapidly and with great accuracy.For example,plant geneticists can isolate a gene responsible for drought tolerance and insert that gene into a different plant.The new genetically-modified plant will gain drought tolerance as well.,What are genetically-modified,What are some of the advantages of GM foods?,The world population has topped 6 billion people and is predicted to double in the next 50 years.Ensuring an adequate food supply for this booming population is going to be a major challenge in the years to come.GM foods promise to meet this need in a number of ways:1).,Pest resistance 2).Disease resistance 3).Cold tolerance,4).,Drought tolerance/salinity tolerance5).Nutrition,Thirteen countries grew genetically-engineered crops commercially in 2000,and of these,the U.S.produced the majority.In 2000,68%of all GM crops were grown by U.S.farmers.In comparison,Argentina,Canada and China produced only 23%,7%and 1%,respectively.Soybeans and corn are the top two most widely grown crops(82%of all GM crops harvested in 2000),What are some of the advantage,What are some of the criticisms against GM foods?,Most concerns about GM foods fall into three categories:environmental hazards,human health risks,and economic concerns.,What are some of the criticism,Every eight seconds,a child somewhere in the world dies from starvation.More than 6 million children under the age of 5 die from starvation every year.,More than 800 million people in the world suffer from chronic malnutrition799 million of them are from the developing world.More then 153 of them are under the age of 5.,Some 700,000 Central Americans are suffering from hunger today,including 6,000 children at risk of staring to death.,Discussion:,What will you think after reading the following facts?,Every eight seconds,a child s,Reading:,Is Yuan Longping more of a scientist than a farmer?,What are Yuan Longpings achievements?,What were his dreams and how far did he achieve them?,Reading:,Gerund,动名词,1.Usage,a.,Climbing mountains,is hard work.,(Its hard work climbing mountains.),主语,She enjoys,acting,.,b.Thank you for,telling me the truth,.,宾语,c.My job is,teaching,.,表语,d.There are a lot of books in the,reading,room.,定语,e.I caught the thief,stealing,.,宾语补足语,Gerund 动名词,2.Verb.,习惯上只接动名词的动词,admit,advise,allow appreciate,avoid,consider,delay,deny,risk,practise,finish,forbid,give up,forgive,enjoy,escape,imagine,mind,mention,suggest,put off,permit,prohibit,report,可接不定式和动名词且含义相同的动词,Like,love,hate,prefer,begin,start,continue,intend,attempt,bother,可接不定式和动名词且含义不同的动词,Remember,forget,regret,try,mean,stop,go on,2.Verb.,3.Tense,现在,I like,collecting stamps,.,Would you mind,closing the door,?,I remember,bringing the book,with me.,b.,完成,He forgot,having promised,me to buy me a CD.,Thank you for,having told,me the news.,3.Tense,4.Voice,He didnt mind,being called,“potato”.,He didnt mind,caring for,the baby.,Notice,:“need”,“want”,“require”,“be worth”,主动表被动,This coat wants washing.,The task is worth doing.,The bike requires/needs mending.,4.Voice,Words&Expressions,Words&Expressions,1.Dr.Yuan,searched for,a way to increase rice harvests without,expanding,the area of fields.,The police are searching for the murderer.,The police are,.,in,of,search,expand:,to become larger in size,增大,The population of China expanded quickly in the 1960s.,You can expand your knowledge by reading more books.,expansion,n.,expandable,adj.,1.Dr.Yuan searched for a way,2.Dr.Yuan is now,circulating,his knowledge in India,.,circulate:,to move around within a system,循环,became
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