eg.Which of the following picture doesn't show the phenomenon?

Step3. Fast-Reading

Match: the main idea of each paragraph. (Divided them into seven groups,each group answer one paragraph.)

Step4. Intensive Reading

1) Analyze paragraph1 and paragraph2 in a way of graph1. Answer two questions.

What is this graph about? What has caused this phenomenon?

2) Listen to paragraph3 and then discuss questions in group to choose right answer.

Greenhouse gases refer to ____.

A. carbon dioxide

B. the burning of fossil fuels

C. byproducts of the burning of fossil fuels

D. coal, natural gas and oil

Greenhouse effect ____.

A. is a natural phenomenon

B. happens when there's too much carbon dioxide

C. does great harm to human beings

D. makes life for human beings better

Summarize this paragraph in a way of simple drawing.