【最新】人教版高中英语必修一课件：Unit+5+Using+Language+(共166张PPT)

• Organic farming is nowhere near able to meet the
5B
high demand for food around the world.
Summary
Chemical pesticides and artificial fertilisers have been in widespread use in farming 1._si_n_c_e__the middle of the 20th century, but scientists found that their long-term use can sometimes do harm to both the land and people's health. In most 2._c_o_u_n_t_r_ie_s__(country ) , some pesticides like DDT have been prohibited because of the damage 3. _c_a_u_s_ed__(cause) to people and the environment.
Unit 5 Working the land
Chemical versus Organic farming
[ˈvɜːsəs] prep.与…相对;与…对阵
Lead-in
What can be used to make plants grow better? Fertilizer.
Chemical fertilizers
organic food when they shop at the local grocery. Organic
farming is simply farming without using any chemicals.

1. Elias was unhappy in the prison because ______. A. he was kept with the criminals B. the prison guard studied with him C. he had to study D. he could not study for a degree
Freedom at last
Find out the main idea for each paragraph. Elias became a good student in prison on Robben Island.
Elias’ job after he finished four years in prison.
THE REST OF ELIAS’ STORY
Elias was sent to Robben Island, a prison from which no one can escape.
prison
Nelson Mandela in prison
Graves on the Island
student.
prison.
3. He realized he was 4. Elias was not allowed clever enough to do to take a degree in
a degree.
prison.
1. What would you have done if you were Elias?
3. Listen again and compare the life and work of white and black people at that time. Fill in the chart below.

The methods to keep the soil fertile
Paragraph 3&4
Tips:
1.They often prefer using natural waste from animals as fertilizer.
2.Then often change …
3.They also plant crops …
chemical fertilizers
chemical farming
natural fertilizers
organic farming
Better？
• What is chemical farming? • Using chemical fertilizers in farming • What is organic farming? • It is simply farming without using
P2.
Farmers and customers turn to
organic farming. (advantages)
P3.
Problems caused by chemical fertilizers.
P4.
Effect of chemical fertilizer
Find out the main idea of the passage by filling in the blanks.
C. They can cause damage to the land.
D. They are benefit for people’s health.
Careful reading
What problems are caused by chemical fertilizers?

Atlantic.
Answer these questions
3. What do you know about the island?
From seventeenth Century, Robben Island became the place where the colonists held the head of the native rebel
He has to reward the men who were once called rebels who helped him come to power.
他必须奖赏帮助他上台执政的人。
The key words and expressions
5. beg v. 请求，乞求，乞讨，恳求（原谅） We are not going to beg for help any more. 我们不会再乞求帮助。 I begged to be allowed to leave. 我请求允许我离开。 They dropped to their knees and begged forgiveness. 他们跪下请求原谅。
1. Have you ever heard the Robben Island? 2. Where is the island located? 3. What do you know about the island? 4. What do you know about the prison on the
4. What do you know about the prison on the island?
Since 1960, Robben Island become a prison for political prisoners in South Africa, and imprisoned more than 3000 black sports leaders and activists.