人教版高中英语必修三Unit 4《Astronomy the science of the stars》(Reading)课件

Ex.5 on P27
How life began on earth is one of the biggest puzzles that scientists found hard to solve. What other puzzles are hidden in the passage?
How does the universe(earth) form? Why did the earth cool down? Why did water disappear on other planet? How did the dinosaur disappear ?
布置作业Homework:
1. Finish the exercise 1and 2 on
page 63 2. Read the text again and find out your difficult points.
ห้องสมุดไป่ตู้
Can you put the order of development of life into a time line?直击高考
8 1. Insects and amphibians appeared. 3 3. The earth became a solid ball. 9 5. Reptiles appeared. 2 7. The earth was a cloud of dust 6 9. Shellfish and other fish appeared. 12 11. Clever animals with hands and feet appeared 10 2. Dinosaurs appeared. 4.Small plants grew on the water. 7 6. Plants began to grow on dry land. 4 8. Water appeared on the earth 1 10. The universe began with a “Big Band”. 11 12. Mammals appeared. 5
Ex.2 on P27
7. Conclude the main idea of each paragraph. 1) A widely ______ _____ of the universe. theory about the origin 2) The formation of the ______. earth 3) The __________ importance of water for life. 4) The development of ______ plants andanimals _______ on the influence earth. humans and their /_____ 5) The arrival of _______ effect on the earth. Ex.1 on P27 8. The main idea of Reading1. The text mainly tells us the _________ formation of the earth and the ___________ development of life on it.
6.What life developed after dinosaurs? mammals on land
7. What life developed after mammals? small clever animals
• What are they doing on the earth?
Because they are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.
The earth may become too hot to live on .
Reading-II----skimming (3m)
• Read paragraph 1, and answer the following questions. • 1.How did water come into being on the earth?
The explosion of the earth produced water vapour, which turned into water when the earth cooled down.
Because water allowed the earth to dissolve harmful gases and acids into oceans and seas.
Stage2 The development of life
1.What life developed after water appeared? small plants appears in water
A. insects and amphibians appear
B. a solid ball
D
B I G
H A C F J
C. reptiles appear
D. a cloud of dust
E. shellfish and other fish appear
F. dinosaurs appear G. small plants grow on the water H. plants begin to grow on dry land I. presence of water J. mammals (including humans )appear
• 2. What is the significance of the presence of water on the earth?
It allowed the earth to dissolve harmful gases into oceans and seas.
Put the order of development of life into a time line.
2.What life developed in water next? Shellfish and all sorts of fish
3.What about the life on land? green plants began to grow on land insects appeared
E
Stage 1: The development of the earth (1) After the Big Bang, what was the earth like? a cloud of dust a solid globe
(2) What happened next? exploded with fire and rock produced water vapour and gases
(4) What appeared as the earth cooled down?
water is important for the beginning of life on the earth.
Water appeared
Why is water so important for the beginning of life?
4. What life developed next on land?
amphibians on land and in the water forests
5.What life developed after forests appeared?
reptiles appeared dinosaur developed