Unit 19 Modern agriculture 第二課時教案

1950s---1980s 1980s--present
the use of machines e.g. tractors
the use of electric pumps for irrigation
the use of chemical fertilizers
the use of insect killers
the use of special seedbeds the use of greenhouses
to make vegetables bigger or better
to change vegetables so they can grow on poor soil
knowledge from abroad

innovations problems advantages
chemical fertilisers shortage of arable land  bigger and better crops
pumps for irrigation weather conditions bigger and better crops
special seedbeds shortage of arable land  more crops in one year
machines e.g. tractors how to make production cheaper (not in the text) bigger crops on more land by fewer hands
international exchange  lack of knowledge learn from other people
greenhouses  weather condition bigger and better crops
greenhouses (roots in water tanks) shortage of arable land more crops in one year
gm technique (can grow in poor soil) shortage of arable land can grow in poor soil; bigger & healthier; less time to ripe
　　4. listening
　　let ss listen to the tape and follow it.
　　5. discussion
　　①let ss work in groups and imagine what other changes have happened on farms in the last 100 years.
　　② let ss discussion the following questions
at the beginning of the passage, why does the writer say “it is on the arable land that the
farmers produce food for the whole population of china”?
what does the writer want to tell us by saying, “not only food production is important but
also taking care of the environment.”?
what can we infer from the sentence “in china about one hundred research stations are now doing gm research to make better tomatoes, cotton…?”
what can you imagine about the future of food production?
　　step iv post-reading
　　1. finish the exercises in studentsbook, page 46, exercise 1-2
　　2. if possible, teacher can get ss read a new text in workbook, page111 , and finish all the exercises.
　　step v. language points and useful expressions
　　1.let ss by themselves find out some phrases or useful expressions, which are important in the text.
　　2. teacher explain language points :
compare to/ with
for thousands of years
make use of
be harmful to
depend on
as well as
not only …but also… protect from
no matter how
be different from
stand for
in other words
the way tomatoes grow from a
natural seed is
changed
a variety of over the years
have an effect on
make good money
make use of
in the 1980s
go against