(共24张PPT)
Page 61 B2
China’s efforts to stop desertification
1978
More than 60
stop animals
how quickly
1995
use water responsibly
Desertification is a serious environmental problem around the world. As the name suggests, when non-desert areas slowly become deserts, desertification happens.
Desertification can be caused by several factors, such as global warming, overpopulation and droughts. If people use the wrong farming methods or cut down too many trees, farmland can turn into desert. With about two billion people directly affected, desertification has become growing concern for many countries.
We need to take steps to prevent desertification. We should pay attention to how much energy we use in our daily life. That way, we can reduce the amount of carbon dioxide released. We can walk or cycle short distances, and use less water. We can also protect our forests by reusing paper and not using disposable chopsticks. What’s more, we should try to make people around us aware of the problem and encourage them to change their daily habits in the same way.
deforestation
desertification
Air Pollution
Water Pollution
We are faced with all kinds of environmental problems nowadays. But what is the one that Rachel Carson dealt with in her book Silent Spring
Pesticides. Pesticides have been regarded by many other environmentalists as a type of pollution, too. It is believed by her that pesticides are poisons which should be used as a last resort and if used, then they should be used with extreme caution.
Rachel Carson (1907-1964) biologist, writer, ecologist
intense love for nature since her childhood→
“Humans have now acquired a fateful power to alter and to destroy nature. But Man is a part of nature, and his war against nature is inevitably a war against himself.”
―Rachel Carson
Author
Background
Her Life
A fable for tomorrow
Adapted from Silent Spring, by Rachel Carson
Part I: Main Idea (Para 1-6)
Contrast: a town before & after the disaster
Before
Color
Sound
Motion
Overall impression:
vibrant,
harmonious,
beautiful
After
Color
Sound
Motion
Overall impression:
lifeless,
deserted,
awful
There was once a town in the heart of America where all life seemed to live in harmony with its surroundings.
Paraphrase:
Once upon a time there was a town in the central part of America where all living things seemed to co-exist peacefully with their environment.
…in spring, white clouds drifted above the green fields.
…in spring, white clouds floated above the green fields just like flowers.
. …delighted the traveler’s eye.(para2)
…gave the traveler great satisfaction / enjoyment (what a harmonious and fascinating view)
…mysterious illnesses swept the flocks of chickens; the cattle and sheep sickened and died. (para. 3)
…strange diseases quickly struck down large numbers of chicken; the cattle and sheep became ill and died.
(para 5) deserted: visited by nobody; abandoned
(para 6) stricken world
strike, struck, stricken：
患病的，受挫的，受…侵袭的
flood-stricken district
earthquake-stricken district
a family stricken by genetically inherited cancer
Part II: Discussion (Para 7)
Why did the author paint such a beautiful picture of a non-existent town What was she trying to appeal to
Nature is innocent, man is a part of nature and is blessed by nature. We human beings should follow nature’s law and feel gratitude for nature’s blessings. Only in this way can we establish a happy homeland.
Nature is an integral nature. We should promote our knowledge of relation of chemicals and ecology. Before we use chemicals, we should know clearly about their effects on the environment and people, and make reasonable use of them.
Page 57 A
economic
living
survive
process
profit
length
poverty
former
B
are alive with
a variety of
came up with
called for/ have called for
sprang to mind
get rid of
In defence of
give rise to
Unit 2 Wordlist（16-19页）
Homework
完成第三十三期报纸；
巩固Unit 2 第16-19页的生词。
