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《Using LanguageⅡ》新课标PPT课件优质课下载
2. After the long-term use of chemical fertilizers, what have scientists found?
Many farmers welcomed them as a great way to stop crop disease and increase production.
Long-term use of chemical fertilizers can cause damage to the land and , even more dangerous, to people’s health.
Recently, however,
therefore; thus ; meanwhile; anyhow; otherwise; moreover; besides ...
Reading
Tips:
clear and reasonable connection between parts.
Read paragraph 2 and find out the problems caused by using chemical fertilizers.
First, they damage … as well as …. They also stay in the … and …. In addition, …grow too fast to ….
Tips: connectives（连接词） and transitional phrases（过渡词） for development
first; second; finally; last but not least, above all, etc.
Read paragraph 3-4
What are the advantages of organic farming?
The farmers focus on keeping their soil rich and free of disease and keeping the air , soil, water and crops free from chemicals.
The methods to keep the soil fertile
1 using natural waste from animals as fertilizer.
2 changing the kind of crop in each field .
3 planting crops to use different levels of soil.
4 planting grass between crops to prevent …
The same goal : ________________________
______________________________________
______________________________
to grow good food and avoid damaging the environment or people’s health.
1 …such as wheat or corn that need rich and fertile soil.