高中英语 必修三 unit4 reading 课件

• Why was the earth different from the other planets?
• What a role the water played in the development of life?
1. According to a widely accepted theory, how did the stars form? The universe began with a “Big Bang” that threw matter in all directions, then atoms began to form and combine to create stars. 2. How did the earth’s atmosphere form? The earth was so violent. It exploded loudly with fore and rock to produce carbon, nitrogen, water vapor and other gases, which were to make the atmosphere.
5. forests
reptiles (huge animal-dinosaurs)
6 . Mammals--clever animals
2.Why did the plants grow before the animals came? Because plants provide oxygen for animals to breathe. 3. Why is it wrong in films and stories to show dinosaurs and people together? Because dinosaurs died out long before human beings developed on the earth.
Before life appeared.
Para.3 The importance of______ water for life
Para.4
The_______________ development of plants and animals
humans and their effects on Para.5 The arrival of _________ the earth
The earth was just a cloud of dust whose future is _________ uncertain after the “Big Bang”. Then the dust began to settle into a _______ ball which is so solid ________ andexploded _______ loudly with fire and rock, to violent be in time to produce many things, which make the earth’s ___________. atmosphere As the earth cooled down, ________ water began to appear and people think it is important for the beginning of life. It allowed the harmful gases. Then life began to earth to dissolve ________ develop.
With so many friends on me, I was happy.
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Humans developed new ________ means of growing, hunting and moving around. As time went by they muchcarbon dioxide covered the earth. Now too _______ has been putting into the atmosphere __________, which prevents ________ heat_____ from escaping from the earth into global warming space. As a result, the problem of ______________ occurs. Whether life will continue on the earth for depend on whether millions of years to come will ___________ this problem can be solved.
I felt lonely and life was dull at that time.
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Part2 (para4~5) How the life developed 1.Make a timeline of the development of life 2.Why did the plants grow before the animals came? 3.Why is it wrong in films and stories to show dinosaurs and people together?
Para5
1 spread 2. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. 3. As a result of this, many scientists believe the earth may become too hot to live on. 4. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.
Unit 4 Astronomy: the science of the stars
How life began on the earth
theory about how the universe was A________ Para.1 formed formationof the earth Para.2 The__________
Different lives developed.
Part1 (para1~3) Before life appeared
• According to a widely accepted theory, how did the stars form? • How did the earth’s atmosphere form?
2. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acid into the oceans and seas. 3 make it possible for life to develop
Para1
1 a widely accepted theory 2 begin with
3 in all directions
Para2
1. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. 2. The earth became so violent that it was not clear whether the shape would last or not.
Now, I’ m worried about the future of myself and humans…
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According to the pictures, have a try to retell the development of life.
Suppose you were the earth, what would you advise humans to do? Write a letter to the human being.
wk.baidu.com
3. Why was the earth different from the other planets? Because the water on other planets had
disappeared later.
4. What a role the water played in the development of life?
Para4
1 on the surface of the water 2 fill the oceans and seas with oxygen 3 live on land as well as in the water 4 produce young by laying eggs 5 the age of the dinosaurs 6 remain a mystery 7. This disappearance made possible the rise of mammals on the earth.
1. small plants
On surface of water
2. Early shellfish and
all sorts of fish
4. land animals
insects (on land) amphibian (on land and in water)
green plants 3. on land
3. What is even more important is that as the earth cooled down, water began to appear on its surface.
Para3
1. It was not immediately obvious that water was to be fundamental to the development of life.
The presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas. This produce a chain reaction which made it possible for life to develop
Nobody understood plants were the start of multiplied and filled the first changes. They ___________ oceans and seas with oxygen. This encouraged the development _____________ of early shellfish and fish. Land animals such as insects, amphibians, reptiles and dinosaurs and so on followed _________ after the first green plants appeared. Dinosaurs disappeared, which made possible the rise of _____________ mammals on the earth. Then small clever animals ____________ all spread over the earth.