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

teaching important points a. talk about the beginning of life on the earth.why did animals first appear in the seas?why did green plants help life to develop?b. discuss the order of development of lifeteaching difficult points a. understand the beginning of life on the earth. b. discuss the questions:what will our future be if the earth may become too hot for the lives on it?why are humans the cleverest animals on the earth? teaching methods a.                   skimming and scanningb.                   asking-and-answering activity to check the ss’ understanding of the text.c.                   individual, pair or group work to finish each task.d.                   discussion.teaching aids a computerteaching procedures  step 1 quizsome questions on ppt.step 2 lead inin our solar system eight planets circle around the sun. what are they? (note：according to the present day scientific study, there are only eight planets, with the pluto excluded.)s: the sun, mercury, venus, earth, mars, jupiter, saturn, uranus, and neptune. t: which planet do we live on? can you describe what it looks like?s: earth. it supports a variety of life and 70% of the earth is covered with seas or oceans. step 3 discussion where do we come from? or we can say: who are our ancestors?
do you know any ancient idea about the beginning of the universe?               pangu separates the sky from the earth.  the sky and the earth were at first one blurred entity like an egg. pangu was born into it. the separation of the sky and the earth took 18,000 years- the yang which was light and pure rose to become the sky, and the yin which was heavy and murky sank to form the earth. between them was pangu, who went through nine changes every day, his wisdom, greater than that of the sky and his ability greater than that of the earth. every day the sky rose ten feet higher, the earth became ten feet thicker, and pangu grew ten feet taller. another 18,000 years passed, and there was an extremely high sky, an extremely thick earth, and an extremely tall pangu. then came the three emperors (the emperor of the sky, the emperor of the earth, the emperor of the men.)