人教版高中英语必修3Unit 4“Astronomy the science of the stars”（Reading）课件.pptVIP

Read paragraph 1, and answer the following questions. 1.How did water come into being on the earth? 2. What is the significance of the presence of water on the earth? Why is water so important for the beginning of life? Because water allowed the earth to dissolve harmful gases and acids into oceans and seas. What are they doing on the earth? Can you put the order of development of life into a time line?直击高考 1. Insects and amphibians appeared. 3. The earth became a solid ball. 5. Reptiles appeared. 7. The earth was a cloud of dust 9. Shellfish and other fish appeared. 11. Clever animals with hands and feet appeared 2. Dinosaurs appeared. 4.Small plants grew on the water. 6. Plants began to grow on dry land. 8. Water appeared on the earth 10. The universe began with a “Big Band”. 12. Mammals appeared. 布置作业Homework: 1. Finish the exercise 1and 2 on page 63 2. Read the text again and find out your difficult points. * The explosion of the earth produced water vapour, which turned into water when the earth cooled down. It allowed the earth to dissolve harmful gases into oceans and seas. Reading-IIskimming (3m) Put the order of development of life into a time line. insects and amphibians appear a solid ball reptiles appear a cloud of dust shellfish and other fish appear dinosaurs appear small plants grow on the water plants begin to grow on dry land presence of water mammals (including humans )appear D B I G E H A C F J Stage 1: The development of the earth (1) After the Big Bang, what was the earth like? a cloud of dust a solid globe exploded with fire and rock produced water vapour and gases (2) What happened next? Water appeared (4) What appeared as the earth cooled down? water is important for the beginning of life on the earth. Stage2 The development of life small plants appears in water 1.What life developed after water appeared? Shellfish and all sorts of fish 2.What life developed in water nex