必修三Unit4-reading课件

1、Unit 4,Astronomy： the science of the stars,1,必修三Unit4-reading,Uranus 天王星,Venus 金星,Earth 地球,Mars 火星,Mercury 水星,Neptune 海王星,Saturn 土星,Jupiter 木星,Quiz: In our solar system eight planets circle around the Sun. What are they? Match the names with the planets,2,必修三Unit4-reading,Fast reading,Read the passa

2、ge quickly and find the main idea,A brief introduction on how the universe developed and how life began on the earth,3,必修三Unit4-reading,Careful reading,Para 1,Para 2: Para 3: Para 4,Para 5,A widely accepted theory about the formation of the universe,The formation of the earth,The importance of water

3、 for life,The development of plants and animals on the earth,The arrival of humans and their impact on the earth,Read the passage carefully and analyse its structure,earth, atmosphere and water,life development,human beings,4,必修三Unit4-reading,1. What is the original earths atmosphere made up of? 2.

4、Why did scientists believe water is fundamental to the development of life? 3. How did water come into being on the earth? 4. Which kind of life-being first appeared on the earth, plants or animals? Why? 5. Why were mammals different from all life forms in the past,Answer the following questions,5,必

5、修三Unit4-reading,Carbon, nitrogen, water vapour, and other gases,2. Why did scientist believe water is fundamental to the development of life,Because water allowed the earth to dissolve harmful gases and acids into the oceans and seas to ensure a following chain reaction, which made it possible for l

6、ife to develop,What is the original earths atmosphere made up of,3. 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,6,必修三Unit4-reading,4. Which kind of life-being first appeared on the earth, plants or ani

7、mals? Why,At first, small plants began to appear on the surface of the water, they produce oxygen, which encouraged the later development of early shellfish and all sorts of fish,5. Why were mammals different from all life forms in the past,They were different because they produced their young from

8、within their bodies and produce milk to feed them,7,必修三Unit4-reading,Let review the evolution of life on the earth,8,必修三Unit4-reading,After the “Big Bang”, the earth was full of water,9,必修三Unit4-reading,Original cells appeared in the ocean,10,必修三Unit4-reading,The cells in the water began to separate

9、. Small plants came into being,11,必修三Unit4-reading,Early shellfish and all sorts of fish,12,必修三Unit4-reading,Some animals (amphibian & insects) came to land,13,必修三Unit4-reading,Reptile appeared,14,必修三Unit4-reading,dinosaurs,15,必修三Unit4-reading,mammals,16,必修三Unit4-reading,Man had evolved from apes,17

10、,必修三Unit4-reading,We are making the world better,We are making the world worse,Discussion,18,必修三Unit4-reading,Because they are putting too much carbon dioxide into the atmosphere,The earth may become too hot to live on,19,必修三Unit4-reading,The earth is becoming hotter and hotter,20,必修三Unit4-reading,solar energy,plant trees,recycle rubbish,save w