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人教2003课标版《Using LanguageⅠ》优质课PPT课件下载
It is fertilizer.
How many kinds of fertilizers do farmers use?
There are two kinds. They are chemical fertilizers and natural ones.
Which kind do farmers use when they are doing organic farming?
Do you know about organic farming?
ORGANIC FARMING
Organic farming is simply farming without using any chemicals.
1. Why are chemical fertilizers so popular in farming today?
I. Read the passage and answer the following questions.
They are a great way to stop crop disease and increase production.
2. What problems can be caused by using chemical fertilizers?
They can damage the land by killing helpful bacteria and pests and by staying in the ground and underground water for a long time. They damage people’s health by building up in their bodies and leading to cancer or other illnesses.
3. What is organic farming?
Organic farming means growing crops without using any chemicals.
4. What is the main reason for using organic farming methods?
The main reason for using organic farming methods is to grow good food and to avoid damaging the environment or people’s health.
II. Read the text again and fill in the blanks.
Stopping crop disease and
increase __________
Advantages
Chemical
Farming
production
Damaging the land:
killing the helpful ________________