新人教选修6_Unit4_Global_warming-Reading[课件]

Reading

What is the greenhouse

made and used for?

A greenhouse is madeof glass and is used for growing plants, especially

during cold weather.

How does it work? The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so the plants can grow throughout the cold period.

What are the “greenhouse gases”?

In the atmosphere surrounding theearth there are gases, which are

called “greenhouse gases”, includingcarbon dioxide, methane(甲烷, 沼气)

and water vapor.

What do you think greenhouse

gases do?They trap heat from the sun and

therefore warm the earth.

Main ideas of each part ( Paragraph 1 ) Introduce a debate over the issue of global warming.

Writing techniques

Raising a question

Main ideas of each part

Writing techniques

(Paragraphs 2---3 ) Illustrate howabout.

Giving examples,using graphs,

global warming comes explanation.

(Paragraphs 4---5 )List two different Giving examples, making contrast.

attitudes amongscientists towards

global warming.

(Paragraph 6 )

It's up to readers tothink and decide

Using a question,leaving readers to

whether people should think over the do something about issue. global warming or not.

Read the text carefully and fill in the blanks. Scientists Opinion Janice ◆ We need 1______ gases like carbon Foster dioxide, methane and water vapour, but if we add huge quantities of extra carbon 2__________ dioxide to the atmosphere by burning fossil fuels, it will cause global temperature to go the 3________________ up.

Scientists Opinion Janice ◆ Over the next 100 years the Foster amount of warming could be as low as 1 to 1.5 degrees Celsius, but it could be as high as 5 degrees Celsius. ◆ An increase of five degrees catastrophe . would be a 4____________

Scientists Opinions

George ◆ Believes that we shouldn’t high levels of Hambley worry about 5__________ carbon dioxide in the air . ◆ Predicts that any warming will be mild with few bad environmental 6___________ consequences . ◆7_______that more carbon States positive dioxide is actually a 8________ thing, which will make life for human beings better.

Choose the best answers. 1. Which of the following is TRUE according to the text? A A. The temperature of the earth increased about one degree Fahrenheit during the 20th century. B. The carbon dioxide content in the air increased by 70 parts per million from 1957 to 1997. C. All scientists accept the data in graph 2 except Charles Keeling. D. Janice Foster says that more carbon dioxide will make plants grow faster.