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人教2003课标版《Using LanguageⅠ》集体备课PPT课件优质课下载
Para2.
Para3.
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Recently, however, scientists have been finding that
long-term use of these fertilizers can cause damage to
the land and, even more dangerous, to people’s health.
What are some of the problems caused by chemical
fertilizers?
With these discoveries, some farmers and many
customers are beginning to turn to organic farming.
Organic farmers also use many other methods to
keep the soil fertile.
Main idea for each paragraph
Problems caused by chemical fertilizers.
Farmers and customers turn to organic farming.
other methods to keep the soil fertile.
Long-term use of chemical fertilizers can cause
damage to the land and people’s health.
Fast-reading
Q1. Why are chemical fertilizers so popular in farming today?
Q2. What problems can be caused by using chemical fertilizers ?
Many farmers welcomed them as a great way to stop crop disease and increase production.
Long-term use of these fertilizers can cause damage to the land and, even more dangerous, to people’s health.
Careful-reading
Para1.