人教版高中英语必修3 unit 4 Astronomy: the science of the stars ---reading 课件 （共18张PPT ）

课件18张PPT。Unit 4
Astronomy:
the science of the stars
A Quiz Game1. How old is the earth?
A. About 3.5 billion years
B. About 4.5 billion years
C. About 5.5 billion years
2. How many planets are there
in the Solar System?
A 7 B 8 C 9
3. Which one belongs to amphibian(两栖动物)?
A . frog B . snake C .dinosaur 4. Which one belongs to reptile(爬行动物）?
A fish B snake C bird
5. On what day is the Earth day celebrated?
A. April 22 B. May 4
C. August 21 D. November 116.which gas is the most important for life?
carbon dioxide (CO2 )

B. oxygen (O2)

C. nitrogen (N2)
Who created the earth?In China:people believe Pangu separates the sky from the earthBible: God created the world in seven days. In India:Brahman (婆罗门) is said to be the creator of the universe. The Big Bang The Big Bang 1. How did stars and other bodies created?
2. What was the earth like after the
“Big Bang”?
3. What made up the earth’s atmosphere
after the earth exploded?
4. What’s the significance(作用) of the presence
of water on the earth?Read the passage and answer the questions.1. How did stars and other bodies were
created?
After the Big Bang, atoms began to form and combine to create stars and other bodies.Scanning 2. What was the earth like after the “Big Bang”?
The earth was still just a cloud of dust.
3. What made up the earth’s atmosphere after the earth exploded?
Carbon, nitrogen, water vapour and other gases.
4. What’s the significance of the presence of water on the earth?
It allowed the earth to dissolve harmful gases and acids into the oceans and seas.Para. 1 The formation (形成) of the
earth.
Para. 2 The importance of water for
life.
Para. 3 A widely accepted theory
about the formation of the
universe.
Para. 4 The arrival of humans and
their impact on the earth.
Para. 5 The development of plants
and animals on the earth.Read the passage carefully and match the main idea with each paragraph.
1.dinosaurs appeared
2.presence of water
3.small plants grew on the water
4.shellfish and other fish appeared
5.a solid ball
6.reptiles appeared
7.a cloud of dust
8.mammals (including humans) appeared
9.plants began to grow on dry land
10.insects and amphibians appeared
Listen to the passage and put the order of development of life into a timeline.75234910618 After the “big bang”, the earth was still just a cloud of ____(dusty). Then it ________(explode)with fire and rock, which were__ time to produce many gases. As the earth cooled down, water appeared.
Summary:fill in the blanksdustexplodedin Then small plants grew. They multiplied and filled the oceans and seas with _______. Many millions of years later the first ______ ______began to appear on land. When the plants grew to forests, ______ appeared for the first time. They produced young by __________(lay eggs). When dinosaurs disappeared, __________appeared,which were very different from other life forms. Finally, ____________ appeared, but they may make the earth become too hot to live on.
oxygengreen
reptileslaying eggsmammalsplantshuman beingsDiscussion Suppose you were the earth , what would you want to say to humans ?
Write a short essay(文章)about how to protect our earth. HomeworkThank you!