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必修4《Using LanguageⅠ》精品PPT课件优质课下载
Applying organic fertilizer
Planting grass
Organic food
Chemical or Organic Farming?
Fast reading: Read the whole passage and get the main idea of each paragraph.
para1:
para2:
para3:
para4:
A new discovery of scientists
Several problems caused by using chemical fertilizers
The advantages of using organic farming
Some methods to keep the soil fertile
1 Why are chemical fertilizers so popular in farming today?
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; meanwhile; anyhow; thus ;otherwise; moreover; besides etc.
Detailed reading: Read the first paragraph and answer the questions:
Tips: the usage of adverbs means clear and reasonable connection between parts.
eg. He studied hard, thus he got high marks.
Read paragraph 2 and find out the problems caused by using chemical fertilizers. How many problems are mentioned in this paragraph?
There are three problems.First, they can damage … as well as …. They also stay in the … and …. In addition, …grow too fast to ….
Tips: Transitional phrases（过渡词）are often used in writing, such as first ,second, besides, last but not least ,etc.