Unit 4 Astronomy: the science of the stars（Warming Up, Pre-reading and Reading）

the possible version below can be used as a material for both retelling and dictation.retelling:  the explosion of the earth produced water vapor, which turned into water when the earth cooled down. water allowed the earth to dissolve harmful gases into the oceans and seas. that made it possible for life to begin to develop. the arrival of small plants encouraged the development of early shellfish and all sorts of fish. many millions of years later the first green plants began to appear on land. later land animals appeared. some were insects. others, called amphibians, were able to live on land as well as in the sea. when the plants grew into forests, reptiles appeared for the first time. later, dinosaurs developed. they became the most important animals on the earth for millions of years. after they disappeared, mammals became more important. they were the last group of animals and they were different because they produced their young from within their bodies. small clever animals, with hands and feet, appeared and spread all over the earth. as time went by, they covered the earth and have become the most important animals on the planet.step 6 discussion1.what should we do with the global warming problem?suppose: some of you are officials of the government/some of you are ordinary people2.suppose you were an expert of astronomy, and now you and your workmates are preparing for a meeting whose topic is the beginning & and the prospect(展望) of the life/ human being on the earth. work in your group, and try to develop your speech!homeworkretell the passage according to the form..remember important language points.english weekly page 4 part 2