学人教版必修三Unit 4 AstronomyThe science of the starsPeriod1Reading教案（3页word版）.docx

2019学年度人教版必修三unit 4 astronomy-the science of the starsperiod1readingknowledge aims: get the students to earn the useful words and expressions: astronomy, system, religion, theory, atom, billion, globe, violent, carbon, atmosphere, unlike, fundamental, harmful, acid, chain, multiply, oxygen, exist, thus, dioxide, puzzle, solar system, in time, lay eggs, give birth to, in ones turn, carbon dioxide, preventfrom.skill aims: improve students reading comprehensive ability and enable them to know about how the earth came into being and the development of life.teaching important and difficult points: discuss the development of life. what will our future be like if the earth becomes too hot to live? and what can we do to prevent such serious situation from happening?step 1 lead-in (individual work)lead in the passage by asking some questions: did human beings live on the earth when the earth came into being? ( monkeys, apes类人猿, gorillas猩猩, chimpanzees黑猩猩, primate灵长目动物) do you know what plays the most important part in our body, water or fat?do you know how did water come into being on the earth?step 2 fast reading (task 1)1. read paragraph 1-3. after having read, let them watch the video of “big bang”, and answer the question “how did water come into being on the earth?” (the explosion of the earth produced water vapor, which turned into water when the earth cooled down.)2. careful reading: read the passage carefully and answer the following questions:1). what is the earths atmosphere made up of?(carbon, nitrogen, water vapor and other gases)2). why was the earth different from other planets? (b)a. it produced a lot of heat. b. the water remained.c. water disappeared. d. it was the oldest planet.3). why was water very important for the beginning of life?(water allowed the earth to dissolved harmful gases and acids into the oceans and seas.)3. do the exercises and then check with the whole class.step 3 intensive reading (task 2)read the whole text and finish the chart. (pair work)development of life(big bang) the earth was still a cloud of dust.(between 4.5 and 3.8 billion years ago) the dust settled into a solid globe.(explode) water vapor and some other gases were produced and made the earths atmosphere.(cool down) water appeared on the earth.(life began) arrival of small plants on the surface of the water.(multiply) the oceans and seas were filled with oxygen and the development of shellfish and other fish were encouraged.(next) green plants began to grow on land.(followed in time) land animals such as insects and amphibians appeared.(plants grew into forests) reptiles appeared.(after that) huge animals, called dinosaurs developed.(dinosaurs disappeared) it made the rise of mammals on the earth possible. step 4 have a discussion (task 3) through the teachers description, we learned the development of life. it is a long and slow process. and the earth is the best place for all the living things to live on. but human beings didnt take care of it. listen to the last paragraph twice with the books closed. 1). what problem is caused by human beings? (b)a. they exist everywhere on the earth.b. they caused global warming.c. they find new methods of growing crops.d. they enjoy hunting and fishing.2). from the last paragraph we can infer that the author is a little -. (c)a. happy b. careless c. worried d. excited step 5 self-assessment write down your opinions according to the questions in the card. 1). can you give a brief introduction to how the universe developed, how life began on the earth and the development of life in your own words? 2). what strategies of reading have you learned in the class? 3). are you active in the class? 4). what problems did you have in reading? 5). what help do you need from the teacher