选择性必修一 U5 Languages around the world - Reading for writing（27张PPT)

(共27张PPT)
Chemical Versus Organic Farming
1. Have you ever been to the countryside
2. Do you know how to work on a farm
Step 1: warming up
Let’s go to the farm!
First, buy or select the seeds from the store.
Second, we need to plough or turn over the soil.
Third , we sow the seeds in the soil.
Finally, we can harvest our grain/sorghum/peanuts .
In order to improve the output of the crop, we need to rid the soil of the weed, water the crop, fertilize the soil and kill off the pest.
water the crop
rid the soil of the weed
fertilize the soil
kill off the pest
to improve the output of the crop
What can be used to make plants grow better
Fertilizer.
Chemical fertilizers
Natural waste from animals
chemical fertilizer
cow dung
用化学肥料和有机肥料的区别:
To protect the crops, farmers have to kill off the harmful pests.
What is used for killing pests, especially insects
Pesticides.
Organic Farming
Organic farming is simply farming without using any chemicals.
Which tomatoes do you prefer
5 yuan / kg
30 yuan / kg
Normal tomatoes
Organic tomatoes
C Organic methods for producing rich soil
D The problems with chemical farming
Para. 1-2
Para. 3
Para. 4
Para. 5
A What organic farming is
B Why man-made chemicals are still used in farming
Match the main ideas (A-D) below with the paragraphs.
Para. Main Idea Detail
1-2 Pesticides can kill helpful _________________
Some pesticides have been ___________ because of the ________________
Crops grown with chemical fertilisers usually _____________ to be full of ______________.
bacteria and insects
prohibited
damage they cause
grow too fast
nutrition
D
Para. Main Idea Detail
3 Many organic farmers use __________________ _____________ as fertiliser.
4 They often ____________________ grown in each field ______________.
They also plant crops that use ______________ of the soil to help keep it rich.
from animals
change the kind of crop
every year
different depths
natural waste
A
C
Para. Main Idea Detail
5 Organic farming is nowhere near able to meet the high _______________________________.
demand for food around the world
B
Read the whole text and Choose the best answers. ( )1．Why did many farmers welcome the introduction of chemical farming A．They can fight crop disease and increase production.B．They harm both the land and people's health.C．They can help produce rich soil.D．They are not expensive.
( )2．What concerns many people about the use of pesticides A．Pesticides can damage the land.B．Chemicals can stay in the soil for a long time.C．Pesticides can kill harmful bacteria and insects.D．Chemicals may make people ill and even cause cancer.
( )3．Why do organic farmers change the kind of crop grown in each field every few years A．It helps put important minerals back into the ground.B．It can avoid damage to the environment.C．It can help increase output.D．The writer didn't tell us.
( )4．Why can't we stop the use of man made chemicals in agriculture entirely A．Organic farming costs us a lot of money.B．Organic farming can meet people's need.C．Chemical farming brought us huge profit.D．Chemical farming helps serve the need for food.
What is your opinion on chemical or organic farming
Discussion
Argumentative Structure:
Topic (your idea)
Supporting evidence
Conclusion
1．Growing rice under high carbon dioxide conditions may ________．
A．increase iron in the rice B．make it less nutritious
C．cause losses of vitamin E D．make it more delicious
解析：细节理解题。根据第二段中的“Rice grown under high carbon dioxide conditions had，on average，13 to 30 percent lower levels...less protein.”可知，B项为正确答案。A、C、D三项的表述均与原文表述不符。 答案：B
2．How can people reduce the nutritional harm of climate change A．By importing rice from China and Japan. B．By taking other kinds of food instead of rice. C．By avoiding eating rice from Southeast Asia. D．By growing rice suitable for the environment.
解析：细节理解题。根据文章最后一句“That is to grow different forms of rice that can adapt to higher carbon dioxide levels.”可知，D项为正确答案。 答案：D
3．What's the author's purpose of writing the text
A．To inform readers what nutrients food crops contain.
B．To call on people to care for the planet they live on.
C．To share the results of some studies on people's diets.
D．To tell readers where food crops are mainly produced.
解析：写作意图题。通读全文可知，本文通过介绍温室气体增加对粮食作物的影响来唤起人们对人类赖以生存的地球家园的保护，故选B。 答案：B
4．In which part of a magazine can you read the text A．Advertisements.　　 B．Art and culture. C．Science reports. D．Business news.
解析：文章出处题。通读全文，尤其是文中的“study”“Researchers”“studies”等可推知，本文是一篇研究报道，在杂志的科学报道部分能读到本文。 答案：C