高中英语必修四Unit2_reading公开课

Unit 2 Working the land

Step 1: warming up

First, buy the seeds from the store.

Second, we need to plough or turn over the soil.

Third , we sow the seeds in the soil.

fertilize the soil

kill off the pest

In order to improve the output of the crop, we need to rid the soil to improve the output of the crop of the weed, water the crop, fertilize the soil and kill off the pest.water the crop rid the soil of the weed

Finally, we h____ our food .

green food

organic food

Skimming

Find out and underline the topic sentences of each paragraph. Para1. Recently, however, scientist have be finding that long-term use of the chemical fertilizers can cause dama to the land and, even more dangerou to people’s health. What are some of the problems caus Para2. by chemical fertilizers?

Para 3. With these discoveries, some farm

and many customers are beginning turn to organic farming.Para 4. Organic farmers also use many

other methods to keep the soilfertile.

ScanningRead the passage,and answer the questions.1. How many problems can be caused by using chemical fertilizers?

2. What are the advantages of organic farming?3. Which one isn't the method to keep the soil fertile?

1. How many problems can be caused by using chemical fertilizers?

There are three problems.First, they can damage … as well as …. Chemicals also stay in the … and …. In addition, …grow too fast to ….

2. What are the advantages of organic farming?

The farmers _______ focus on keeping their soil rich and free of disease and keeping _______ the air , soil, water and crops _________ free from chemicals.

3. Which one isn't the method to keep the soil fertile? A. using natural waste from animals as fertilizer. B. changing the kind of crop in each field .

C. planting crops to use the same level of soil.

D. planting grass between crops to prevent wind or water from carrying away the soil.

ConsolidationThe structure of this passagepara1. A new discovery of scientists. para2. Several problems caused by using chemical fertilizers. para3. The advantages of using organic farming. Topic (present situation)

ProblemsAdvantages

para4. Some methods to keep the soil fertile.

Methods(conclusion)

The type of the article is_____________ exposition(说明文)