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人教2003课标版《Using LanguageⅠ》优质课PPT课件下载
Super hybrid rice
What is his achievement ?
Can you think of other ways to increase our crop harvest?
What makes crops grow faster & better ?
Step Ⅱ.Brainstorm
It is fertilizer.
fertilizer
How many kinds of fertilizers do you know?
There are two kinds.
chemical fertilizers natural fertilizers
chemical farming
chemical fertilizers natural fertilizers
Better ？
organic farming
Chemical or organic farming? P14.
Step Ⅲ. Reading
Para.1.
★The main idea of each para:
Long-term use of chemical fertilizers can
cause damage to the land and people’s health.
Problems caused by chemical fertilizers.
Farmers and customers turn to organic
farming.
Other methods to keep the soil fertile.
Para.2.