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《Using LanguageⅠ》最新PPT课件优质课下载
Better？
Reading &Writing
CHEMICAL OR ORGANIC FARMING?
Read Paragraph 1 and answer::
1. Why have chemical fertilizers been so popular in farming over the past half century?
2. What have scientists discovered recently?
stop…and increase…
Long-term use of chemical fertilizers can cause damage to…
Read Paragraph 2 and answer::
How many problems can be caused by using chemical fertilizers?
First, they can damage … as well as …. Chemicals also stay in the … and …. In addition, …grow too fast to ….
Methods
Advantages
◆Use _______ waste from animals
◆Change ____________ in each field every few years
◆Plant crops with different depths of ___
◆Plant _____ between crops
◆make the soil ____ in minerals and more _____
◆put _________________ back into the soil, making it rich and fertile
◆use __________ of soil
◆prevent wind or water from _________ soil and act as _____________
Read Paragraph 3&4 and fill in the chart
natural
the kind of crop
carrying away