人教版高一英語(yǔ)必修4 Unit 2 Working the land reading 課件（共21張）

1、 Task 1: BrainstormingTask 1: Brainstorming What will you think of when you see the word “agriculture”? agriculture farm irrigation food crop field plants plain GMF grain farmer fertilizer seed prairie countryside land arable land agricultureagriculture wheat corn rice soybean cotton broomcorn peanu

2、t Terrace Drought Irrigated land Greenhouse 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 Cl

3、imateControlled Climate in bad weather, crops lostclimate 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. What are geneticall

4、y-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 increa

5、sed 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.

6、 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

7、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. farme

8、rs. 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 criticisms against GM foods? Most concerns about GM foods fall into three categories: envi

9、ronmental hazards, human health risks, and economic concerns. 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 millio

10、n 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? Reading: Is Yuan Longping m

11、ore of a scientist than a farmer? What are Yuan Longpings achievements? 1.What were his dreams and how far did he achieve them? Gerund Gerund 動(dòng)名詞動(dòng)名詞 1. Usage a. Climbing mountains is hard work. (Its hard work climbing mountains.) 主語(yǔ)主語(yǔ) She enjoys acting. b. Thank you for telling me the truth. 賓語(yǔ)賓語(yǔ) c.

12、 My job is teaching. 表語(yǔ)表語(yǔ) d. There are a lot of books in the reading room. 定語(yǔ)定語(yǔ) e. I caught the thief stealing. 賓語(yǔ)補(bǔ)足語(yǔ)賓語(yǔ)補(bǔ)足語(yǔ) 2. Verb. 習(xí)慣上只接動(dòng)名詞的動(dòng)詞習(xí)慣上只接動(dòng)名詞的動(dòng)詞 admit, advise, allow appreciate, avoid, consider, delay, deny, risk, practise, finish, forbid, give up, forgive, enjoy, escape, imagine, mind, me

13、ntion, suggest, put off, permit, prohibit, report 可接不定式和動(dòng)名詞且含義相同的動(dòng)詞可接不定式和動(dòng)名詞且含義相同的動(dòng)詞 Like, love, hate, prefer, begin, start, continue, intend, attempt, bother 可接不定式和動(dòng)名詞且含義不同的動(dòng)詞可接不定式和動(dòng)名詞且含義不同的動(dòng)詞 Remember, forget, regret, try, mean, stop, go on 3. Tense 現(xiàn)在現(xiàn)在 I like collecting stamps. Would you mind cl

14、osing the door? I remember bringing the book with me. b. 完成完成 He forgot having promised me to buy me a CD. a.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”, “require”, “be worth”主主 動(dòng)表被動(dòng)動(dòng)表被動(dòng) This coat want

15、s washing. The task is worth doing. The bike requires/needs mending. 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 . inofsearch expand: to become larger in size 增大增大 The popu

16、lation 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循環(huán)循環(huán) became known by others交流交流 Rumors circulated quickly. The blood circul

17、ates 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 of Thanks 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. Sh

18、e is trying to rid herself of a dependence on drugs. You should rid yourself of the bad habits. = You should get rid of the bad habits 4.So he gives millions of yuan to equip others for their research in agriculture. equip: to provide with things The boys equipped themselves with torches and rope, and set off. The emergency services are equipped to deal with di