人教版高一英语必修4 Unit 2 Working the land reading 课件（共21张）.ppt

1、Unit 2 Working the landTask 1:BrainstormingWhat will you think of when you see the word“agriculture”?agriculturefarmirrigationfoodcropfieldplantsplainGMFgrainfarmerfertilizer seedprairiecountrysidelandarablelandagriculturewheatcornricesoybeancottonbroomcornpeanutTerraceDroughtIrrigated landGreenhous

2、eIn 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 ClimateControlled Climate in bad weather,crops lostclimate

3、controlled,less damageThe 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.What are genetically-modified foods?The term GM foods or GMOs(genetically-modified or

4、ganisms)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 rapi

5、dly 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 some of the advantages of GM foods?The world population has toppe

6、d 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 tolerance4).Dr

7、ought tolerance/salinity tolerance5).NutritionThirteen 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.Soy

8、beans and corn are the top two most widely grown crops(82%of all GM crops harvested in 2000)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.Every eight seconds,a child somewhere in

9、 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

10、 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?Reading:1.Is Yuan Longping more of a scientist than a farmer?2.What are Yuan Longpingsachievements?3.What were his dreams and how far did h

11、e achieve them?Gerund 动名词1.Usagea.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2.Verb.习惯上只接动名词的动词admit,advise,al

12、low 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 on3.T

13、ensea.现在b.I like collecting stamps.c.Would you mind closing the door?d.I remember bringing the book with me.e.b.完成f.He forgot having promised me to buy me a CD.g.Thank you for having told me the news.4.Voice He didnt mind being called“potato”.He didnt mind caring for the baby.Notice:“need”,“want”,“r

14、equire”,“be worth”主动表被动This coat wants washing.The task is worth doing.The bike requires/needs mending.Words&Expressions1.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 .inofsearchexpand:to become lar

15、ger 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.2.Dr.Yuan is now circulating his knowledge in India,.circulate:to move around within a system循环 became known by others交流Rumors circulated quickly.The blo

16、od circulates around the body.circulation n.3.Thanks to his research,the UN is trying to rid the world of hunger.thanks to:due to because ofThanks to your help,I passed the exam.Thanks to his help,Jane will be back soon.rid sb./sth.of sth.The vaccination program will rid the world of smallpox.She is

17、 trying to rid herself of a dependence on drugs.You should rid yourself of the bad habits.=You should get rid of the bad habits4.So he gives millions of yuan to equip others for their research in agriculture.equip:to provide with thingsThe boys equipped themselves with torches and rope,and set off.T

18、he emergency services are equipped to deal with disasters of this kind.We want our son to have an education that will equip him for later life.equipment n.5.It also refers to crops growing with natural rather than chemical fertilizers.6.Putting this in their fields,they argue,makes the soil richer in minerals and so more fertile.