Para. 5 The formation of the earth

　　Task2: Scanning (Para1,2,3)

　　the beginning of water& the beginning of life

　　1. Make the Students read paragraph 1 and answer the following questions. What is the important event(事件) to the earth before the appearance of water?

　　Why is water important for the beginning of life?

　　2. Make the Students read paragraphs 2-3 and finish the following chart.

　　A cloud of dust →a solid ball →presence of water →small plants grow on the water→ shellfish and other fish appear →plants begin to grow on dry land→ insects and amphibians appear→ retiles appear →dinosaurs appear→ mammals appear

　　Q: Why was it necessary for plants to grow before animals?

　　(Plants provided oxygen for animals to breathe.)

　　Task3: Careful-reading

　　Read the text carefully and discuss these questions in pairs.

　　1. Why the earth was different from the other plants?

　　2. Why did the plants grow before the animals came?

　　3. Why did animals first appear in the sea not on the land?

　　4. What is the main difference between reptiles and mammals? Can you give some examples of mammals?

　　Task4: Retell the text

　　Good morning/afternoon. I am Dr.... I am greatly honored to be here to give you a speech about the development of life". ... 　　Step4: Cooperative learning

　　Activity 1: Discussing--- How to protect our earth and make it a better place to live on ?

Earth is home to us the living things. We ought to take good care of it. Do we human beings look after the earth well? What problems have been caused by humans to the earth? (air/water/earth pollution, global warming, desertification, endangered wildlife...)