必修四Unit 2 Working the land教案（集體備課）

well, today we are going to do some reading. please turn to page 13. we’ll read this material first.

step ⅱ reading
there are three tasks in this step. first, teacher can ask students to read the articles one paragraph by one paragraph. ask them some questions about these passages. there are three paragraphs in the article. in each passage, there are one or two questions. when students finish these questions, they will find that the structure of the text has turned up.
t: wonderful! homework check is over. in the last two periods we talked about agriculture. as people’s living condition improves, more and more people are concerned about what they eat. in fact more and more people become worried about the quality of the food they eat. because more and more farmers use chemical fertilizer instead of natural waste from animals and they use poison to kill insects to protect their plants. so people now all want to eat green food which does no harm to their health. they are more concerned about organic farming. now let’s read the text and know something about organic farming.
task 1: questions about the text.
show the questions on the screen:

1. what is the organic farming?
2. what is the advantage of using natural fertilizer?
3. what is the disadvantage of using chemical fertilizers?
4. what’s the main idea of paragraph 3?
5. why do farmers grow their crops in such ways?

t: boys and girls, today we’ll read the text one paragraph by one paragraph. now please read the first paragraph quickly, and find the answer to the first question: what is the organic farming?
s1: organic farming refers to crops growing with natural rather than chemical fertilizers.
t: good. now read the second paragraph quickly and find the answer to this question: what are the advantage of using natural fertilizer?
s2: make the soil richer in minerals and so more fertile.
t: anything else?
s3: reduce diseases in crops and help them grow strong and healthy. besides, keep the air, soil and water as well as the food supply free from chemical.
t: what is the disadvantage of using chemical fertilizers?
s4: let me answer it. there are three disadvantages. firstly, leaving chemicals in the ground for a long time is not good for the soil or the water supply. secondly, farmers often grow the same crop year after year. as a result, the soil gets exhausted. thirdly, chemical fertilizers kill both helpful and harmful bacteria and pests.

main idea of the passage
chemical fertilizers can cause many problems, so organic farming is becoming