高中英语必修4unit2：Using-language(共20张)课件

1、 Unit 2 Working the land Using language Unit 2 Working the lanReadingCHEMICAL OR ORGANIC FARMING?ReadingCHEMICAL OR ORGANIC FARAdd fertilizer into the soil How can farmers make the plants grow well?Add fertilizer into the soil HHow many kinds of fertilizers do farmers use? natural fertilizerorganic

2、farmingchemical fertilizerchemical farmingTwo kinds. Discussion: Which kind of farming is better?BetterHow many kinds of fertilizers chemical fertilizer cow dung用化学肥料和有机肥料的区别:chemical fertilizer cow dung用化 ORGANIC FARMING Organic farming is simply farming without using any chemicals. ORGANIC FARMING

3、Lets learn more about chemical and organic farming! Lets learn more about chemicaThe main idea of each paragraphFast Readingpay attention to the first and the last sentence of each paragraphThe main idea of each paragrapLong-term use of chemical fertilizers can cause damage to the land and peoples h

4、ealth.Problems caused by chemical fertilizers.The main idea of each paragraphP1.P2.Farmers and customers turn to organic farming.Other methods to keep the soil fertile. P3.P4.Long-term use of chemical fertCareful ReadingWhy are chemical fertilizers so popular in farming today?Because they are cheap.

5、They are a good way to stop crop disease and increase production.They can cause damage to the land.They do good to peoples health.Paragraph ICareful ReadingWhy are chemicaChemical farming advantages problems cause stop crop disease increase productiondamage thelandby killing the helpful bacteria and

6、 pests as well as the harmful ones.affect crops-animals and humansby staying in the ground and underground water for a long timelead to cancer/illnessesby building up in peoples bodies over timehave lessnutritionby growing too fastParagraph 2Chemical farming advantages No use of chemical fertilizers

7、 Keep soil rich in mineralsand free of disease helps crops grow strong and healthy Keep the air, soil, water and crops free from chemicalsadvantages of organic farming:Paragraph 3 No use of chemical fertilize1. What is “organic farming”? Answer the questions.It refers to crops growing with natural r

8、ather than chemical fertilizers.2. What do organic farmers prefer to use as fertilizer? Natural waste from animals.1. What is “organic farming”? Organic farming methods advantagesuse natural wastemake the soil rich in mineralschange the kind of cropput minerals back into soil, makingplant crops with

9、 different levels of soilsuse different levels of land plant grass between cropspreventfrom,a natural fertilizerParagraph 4 Find and write down the methods and advantages in the passage.Organic farming methoWhat is the main goal for using organic farming methods?To grow good food and to avoid damagi

10、ng The environment or peoples health.What is the main goal for usin1. Which statement is WRONG according to the text? A. All crops are organic. B. Recently, the term “organic farming” has gained another meaning. C. All farmers use fertilizers. D. Scientists believe some chemical fertilizers are bett

11、er for people.Read again and choose the best answer. D1. Which statement is WRONG ac2. Which is not the reason why organic farmers prefer natural waste from animals? A. It can keep the food free from chemicals. B. It can keep the air, soil and water free from chemicals. C. It can kill harmful pests.

12、 D. It can make the soil richer in mineral.C2. Which is not the reason why3. What is the advantage of using chemical fertilizers? A. Leaving chemicals in the ground for a long time is good for water supply. B. They can get the soil exhausted. C. They can kill helpful bacteria. D. They can kill harmful pest. D 3. What is the advantage of us4. The organic farmers do the followings except _.A. adding chemicals fertilizers which is rich in mineralB. changing crops e