人教新课标高中英语必修4 life began on the earth(reading) 下学期 课件

1、Unit4 Astronomy -the science of the stars,Period 1,What subjects do you learn at school?,Chinese Mathematics English Politics History Geography Physics,Biology Chemistry Computer P.E Music Art,Step1: Warming up brainstorming,What do we think of as science subjects?,astronomy,geophysics,biochemistry,

2、medicine,biology,physics,geology,mathematics,chemistry,Some science subjects combine 2 or more of other subjects, such as medicine, biochemistry, geophysics and astronomy.,medicine = chemistry & biology biochemistry = biology & chemistry geophysics = geology & physics astronomy = mathematics & physi

3、cs,What do they combine?,astronomy biochemistry geophysics medicine,_ the scientific study of treatment of diseases and injures _ the study of the chemistry of living things _ the scientific study of the earths atmosphere, oceans and climate _ the scientific study of objects in space, such as planet

4、s, stars, comets and “black holes”,astronomy,medicine,biochemistry,geophysics,Fill in the blanks,careful patient self-confident persistent be logical be able to draw conclusion ,What are the most important skills we need to be real scientists?,Step 2 Pre-reading,1. How did the universe begin?2. How

5、did life begin on the earth?,There are different legends(传说) of how the universe and life began in different cultures:,In Chinese culture,Pangu separated the the sky from the earth,The Goddess Nuwa mended the heaven and created human beings,In western culture: God created the world in seven days,Do

6、you know what a scientific idea is?,1. The universe began from the Big Bang.,2. Life first began in the sea on the earth.,3. Life was brought to the earth by ET from outer space.,1. Whats the main idea of the text? 2. How many parts can the text be divided into? Whats the main idea for each part?,St

7、ep 3: Reading Fast-reading,1. Whats the main idea of the text?,How life began on the earth.,2. How many parts can the text be divided into?,Part 1 (para 1) Part 2 (para 2&3) Part3 (para 4),The development of animals and plants. Water made it possible for life begin to develop. Humans spread all over

8、 the earth but they are not take good care of it.,Stage 1: The development of the earth,(1) After the Big Bang, what happened?,a cloud of dust,a violent solid ball,exploded with fire and rock,produced water vapour and gases,(2) What happened next?,(3) What did water vapour and gases make?,the earths

9、 atmosphere,Water appeared important for the beginning of life on the earth,(4) What appeared on the earth then?,1.How did water come into being on the earth? 2. What is the significance of the presence of water on the earth?,The explosion of the earth produced water vapour, which turned into water

10、when the earth cooled down.,It allowed the earth to dissolve harmful gases into oceans and seas.,Careful-reading,arrival of small plants in water,(1) What life developed after water appeared?,early shellfish,Stage 2: The development of life in water,all sorts of fish,Stage 2: The development of life

11、 in water,(2) What life developed in water next?,green plants on land,insects on land,(1) What life developed after the life in water?,Stage 3: The development of life on land,amphibians on land and water,forests,Stage 3: The development of life on land,(2) What life developed next on land?,reptiles

12、 on land,dinosaurs on land,Stage 3: The development of life on land,(3) What life developed after forests appeared?,mammals on land,(4) What life developed after dinosaurs?,Stage 3: The development of life on land,humans came into being,Stage 4: The development of humans,(2) What life developed afte

13、r mammals?,They developed new methods of growing food, hunting,and moving around.,1. What did humans develop?,They are putting too much carbon dioxide into the atmosphere.,2. What problem are humans causing?,Step 4 Comprehending,1. Why was the earth different from other planets?,2. Why was life able

14、 to develop on the earth but not on other planets?,3. Why was it necessary for plants to grow before animals?,4. What problem is caused by human beings?,A. B. The water remained.,B. The earth did not have harmful gases in its atmosphere.,B. Plants provided oxygen for animals to breathe.,B. They caus

15、e global warming.,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 hu

16、mans )appear,D,B,I,G,E,H,A,C,F,J,Discussion Why is it wrong in films and stories to show dinosaurs and people together?,Dinosaus died out long before human beings developed on the earth.,Conlidation(class work) Complete the passage according to the text,The explosion of the earth produced_, which tu

17、rned into water when the earth cooled down. Water allowed the earth to _into the oceans and seas. That made it possible for life to begin to develop. The _encouraged the development of early shellfish and all sorts of fish. Many millions of years later _ began to appear on land. Later land animals a

18、ppeared. Some were insects. Others, called _, were able to live on land as well as in the sea.,water vapour,dissolve harmful gases,arrival of small plants,the first green plants,amphibians,When the plants grew into forests, _ appeared for the first time. Later, _ developed. They became the most important animals on the earth for millions of years. After they disappeared, _ became more important. They were the last group of animals and t