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必修4《Using LanguageⅠ》PPT课件优质课下载
It is fertilizer.
How many kinds of fertilizers do farmers use ?And what are they?
There are two kinds. They are chemical fertilizers and natural waste from animals.
Chemical or organic farming?
Structure of the text
Para1: Using chemical fertilizers can hurt the land and also people’s health.
Para2: Problems caused by chemical fertilizers
Para3: Organic farming is becoming more popular with some farmers and many customers
Para4: Other methods to keep the soil fertile.
Step2 Fast reading
Main idea of the passage
________ fertilizers can cause many ________, so organic farming is
becoming more________.
Chemical
problems
popular
Step3.Careful reading
Para1: Using chemical fertilizers can hurt the land and also people’s health.
1.Why are chemical fertilizers so popular in farming today?
2.Do you think it is really a great way?
They are a great way to stop crop disease and
increase production.
No
Firstly, they damage the land by killing the helpful bacteria and pests.
Secondly, Chemicals’ staying in the ground and