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必修4《Using LanguageⅠ》最新PPT课件优质课下载
Natural fertilizers
Natural waste from animals and dead plants
Now, which one do you prefer?
A
B
a product of
chemical farming
a product of
organic farming
green food
organic food
1.Do you know what is organic farming?
2.Which kind of fertilizer do farmers use when they are doing organic farming, chemical fertilizers or natural fertilizers ?
Pre-reading
Chemical Or Organic Farming?
Reading
1. Scan the passage and get the main idea of it.
The ____________ between _________ farming and __________ farming.
comparison
chemical
organic
2. Find out and underline the topic
sentence of each paragraph.
Recently, however, scientists have been
finding that long-term use of the