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必修4《Using LanguageⅡ》优质课PPT课件下载
Finish writing a related composition.
Para 1.
Para 2.
Para 3.
Para 4.
Long-term use of chemical fertilizers can cause damage to land and human being.
Farmers and customers turn to organic farming.
Problems caused by chemical fertilizers.
Other methods to keep the soil fertile.
I. Revision: Topic sentence of each paragraph
illustration
（阐明问题）
comparison
conclusion
Step 2. Organzation of the writing
Read Para 2 again, find out some useful expressions to describe a problem.
What are some of the problems caused by chemical fertilizers? First, they damage the land by killing the helpful bacteria and pests as well as the harmful ones. Chemicals also stay in the ground and underground water for a long time. This affects crops and, therefore, animals and humans , since chemicals get inside the crops and can’t be washed off. These chemicals can lead to cancer or other illnesses. In addition, fruit, vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition. They may look beautiful, but inside there is usually more water than vitamins and minerals.
damage the land
affect crops
lead to cancer
stay in…
get inside…
II. Organzation of the writing
Read Para 2 again, find out how the writer organizes his opinions.
What are some of the problems caused by chemical fertilizers? First, they damage the land by killing the helpful bacteria and pests as well as the harmful ones. Chemicals also stay in the ground and underground water for a long time. This affects crops and, therefore, animals and humans , since chemicals get inside the crops and can’t be washed off. These chemicals can lead to cancer or other illnesses. In addition, fruit, vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition. They may look beautiful, but inside there is usually more water than vitamins and minerals.