Unit 2 Saving the earth. Topic 2 All these problems are very serious. Section C 课件(26张PPT)

课件26张PPT。Unit 2 Saving the Earth Topic 2 All these problems are very serious. Section CImportant words and phrases:
take away ;hole; directly; form; escape; rise; refer to; the greenhouse effect;2. To know something about environmental problems and effect.3. To improve the skills of reading .Learning Aims!4. To know the importance of protecting our environment.Let’s look at what have happened to our earth recent years. We must know more about the problems and save the earth. Our earth is ill, and she is being sent to hospital. We have but one earth!!!
cut down take away forests , animals, plants拿走、带走Let’s talk about the environmental problems and effect!
problemcars and buseshealth problemseffect factories rivers and lakesproblemeffect oxygen a special kind of oxygen
氧气Do you know?called “ozone” (O3)
a very big hole in the ozone layer,
too much harmful radiation from the sun
will reach the earth directly直接地放射，放射物 n.洞，坑臭氧层 cause the level of the sea to rise

v.上升；起床；升起温室效应called “the greenhouse effect” or “global warming”fewer treesfactory pollutiontraffic pollutionthe ozone layermore carbon dioxideCan you match them. Before readingCan you predict what we are going to learn?Reading SkillsSkimming-Read the article quickly to find out the main idea.( eg. the title, the heading, the ending…)
Scanning-Look though the passage quickly to find out the key information.
Careful reading-Read for details.
Further reading-Know more about the passage.SkimmingWhat is the best title for this passage ?
Environment Problems B. Pollution on the Earth
C. Hope for the Future D. The Greenhouse Effect 主旨大意，统观全局，切勿以偏概全。ScanningTask
Chose suitable titles for paragraphs 2-6.
A. Traffic pollution B. Factory pollution
C. Fewer trees D. The ozone hole
E. More carbon dioxideC A B D E 抓关键词，快速查找。1.What does our planet mean here?
A. The sun. B. Mars.
C. The moon. D. The earth.2.In the passage, blanket refers to ____.
A. carbon dioxide around the earth
B. the ozone layer in the sky
C. the forests around the world
D. pollution all over the world3.The word it in Paragraph5 refers to ____.
A. CO2 B. O3 C. O2 D. H2OCareful reading.4.According to the greenhouse effect, which effect is not true?
A. Carbon dioxide will increase a lot. B. The level of the oceans will rise. C. Climate will change a lot. D. The temperature will rise.综合理解，理清关系。猜测词意，语境替换。Further reading.Watch and read !Further reading.Write down only the key words when taking notes. Task
Complete the notes according to the passage.Retell it cars and buses pollute air, health problemspollute land and water, rivers and lakes deadharmful radiation reaches the earth, cause cancer factory pollution ozone hole more CO2Let’s retell it! The earth is 4.6 billion years old. We humans have lived on the earth for only 35 000 years, but during this period, we have changed our planet a lot in many ways. Some things we’ve done are very good for the earth while some are bad.
All over the world, people have cut down millions of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so many kinds of animals and plants are disappearing. In big cities, cars and buses have polluted the air. Now many people in cities have health problems. Factories have also polluted the land and the water. As a result, many rivers and lakes are now dead.
Around the earth, there’s a special kind of oxygen called “ozone”(O3). It is important to the earth. But now air pollution is destroying it and making a very big hole in the ozone layer. Too much harmful radiation from the sun passes through the hole and reaches the earth directly. This is very dangerous because this kind of radiation can cause cancer. Carbon dioxide (CO2) in the air has increased a lot. It mainly comes from burning oil, coal and wood. This has formed a blanket around the earth. The heat from the sun can’t escape so the temperature is rising. This is called “the greenhouse effect”. It causes the level of the oceans to rise and the climate of the earth to change.
All these problems are very serious, so we must do something now. Let’s talk about what we can do to save the earth! After reading.We learn: 1. Some words: hole, form, rise
2. Some phrases: take away,
refer to
3. Some sentences:
All these problems are very serious, so we
must do something now.
We can: 1. Talk about the harm of pollution.
2. Combine the key points to form a
short passage.
SummaryLet's review!Exercise1.Who has _________ my dictionary? It was here just now.
2.There is a __________ in my sock. It’s broken.
3.The weather report says the temperature will ________ tomorrow.
4.You know who I __________ just now.
5.Can you use the letter to ___________ a word? Fill in the blanks. refer to form hole rise take away taken awayholerisereferred toformThank you! Bye!