人教高中英语必修3 Unit4 Unit 1 Astronomy: the science of the stars Reading（共56张PPT）

(共56张PPT)
Astronomy:
Unit 4
the science of the stars











Comet
Solar
system
Thinking:
How did the universe come into being?
Some legends about the formation of the universe in each religion and culture.
In Chinese legend, it says ____________
created the world. He seperates the sky
from the earth and his whole _____ turns
into all kinds of things in the universe.
Pangu（盘古）
body
Pan’gu separated the earth and sky with an ax. After he died, his breath became wind and cloud; his voice became thunder and his left eye sun and right one moon; arms and legs became edges and mountains; blood became rivers and tendon (筋脉) became roads; muscles became fields and hair stars; teeth and bones became metals, pearls and jade; sweat became rain.
the God
Adam and Eve
In Bible,the world and the whole universe
was created by __________, who created
the first man and the first woman called
________________.


The Biblical Account
Day 1: God spoke and separated light from darkness creating Day and Night
Day 2: God spoke and separated the water creating sky and ocean
Day 3: God spoke and created dry land
上帝创世说：
Day 4: God spoke and created the sun, moon and stars
Day 5: God spoke and created living creatures in the air and sea
Day 6: God spoke and created the land animals and man
Day 7: God rested and blessed this day calling it Holy
Do you think these legends
are scientific?
Do you know anything about the

Big Bang
?
The Big Bang is the term used to describe a huge explosion which threw matter in all directions, it created our universe. And our universe began in a big bang about15 billion years ago.

This is how our universe began.
After the “Big Bang”, what happened to the earth?
Now let’s read the passage on P25 to find the answer



Thinking:

ON THE EARTH
How
LIFE BEGAN
?
Unit4 reading

Go through the text quickly and choose the main idea for each paragraph.
Task 1: Skimming
While-reading
Skim the passage and match the main idea with each paragraph.
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.







Q2:What’s the main idea of the text?

A. how did water begin?

B. how did earth begin ?

C. how did man begin ?

D. how did life begin ?
Read the text carefully and think about what you have read and do the
following exercises.
Task 2: Close reading
While-reading


settled into


Explode with fire and rock to produce carbon, nitrogen, water vapour and other gases.


dissolve harmful gases





Cool down
Listen to the tape and Read the first three paragraphs and do this exercise in pairs.
After
was still
became
so violent
To make
into

The universe began with a “big bang”


After the “Big Bang”, the earth was just ______________
A cloud of dust
A solid ball
_________________was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe
What it was to become
Violent earth
the earth became so ________ that it was not clear whether the shape would last or not. It exploded loudly with fire and rock,
violent
Atmosphere
They were in time to produce _________________________________________________________which were to make the earth’s atmosphere.
carbon, nitrogen, water vapour and other gases,
Presence of water
What is even more important is that as the earth cooled down, water began to appear on its surface.
Water stayed
Water had also appeared on other planets like Mars but, unlike the earth,it had disappeared later.
Moon
Mars
special

It was not immediately obvious that water was to be fundamental to the development of life.
Harmful gases
What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.
Possible life
This produced a chain reaction,which made it possible for life to develop.


settled into


Explode with fire and rock to produce carbon, nitrogen, water vapour and other gases.


dissolve harmful gases





Big Bang
a cloud of dust
a solid globe
Atmosphere
Water
oceans and seas
Cool down
The process of the Earth formation
After
was still
became
so violent
To make
into



Listen and Read the last three paragraphs and then complete the blanks.
.
1. small plants in water

2.
3. ________ on land

4. insects(on land)
5.
6. forests

7. reptiles(on land)
8.
9.
10. small clever animals
with ____ and ____

11.
______ and all sorts of fish
_________(on land and in water)
________(on land)
________(on land)
_______
The development of life on the earth
Oxygen
They multiplied and filled the oceans and seas with oxygen.
Shellfish and other fish appear
which encouraged the later development of early shellfish and all sorts of fish.
Next, green plants began to grow on land
Carbon dioxide
They were followed in time by land animals.
Insects appear
Some were insects.

Amphibians appear
Others, called amphibians, were able to live on land as well as in the water.
Reptiles appear
When the plants grew into forests, reptiles appeared for the first time. They produced young generally by laying eggs.
Dinosaurs appear
After that, some huge animals, called dinosaurs, developed. They laid eggs too and existed on the earth for more than 140 million years..
Mammals appear
This disappearance of dinosaurs made possible the rise of mammals on the earth.
Produce young
These animals were different from all life forms in the past, because they gave birth to young baby animals and produce milk to feed them.


Animals with four hands and feet
Small clever animals, now with hands and feet, appeared and spread all over the earth.
Humans appear
Thus they have, in their turn become the most important animals on the planet.
Greenhouse effect
But they are not looking after the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.

Too hot
The earth may become too hot to live on.
future
Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.




1



2


3






4
5

6


7

8

9
Small plants in water
Shellfish and all sorts of fish
Green plants on land
Insects (on land)
Amphibian (on land and in water)
Forests
Reptiles (on land)
Dinosaurs (on land)
Mammals (on land)

10___________
humans

The development of life
10
7
3
8
4
9
6
1
5
2
12
11
1. Insects and amphibians appeared.
3. The earth became a solid ball.
5. Reptiles appeared.
7. The earth was a cloud of dust.
9. Shellfish and other fish appeared.
11. Clever animals with hands and feet appeared.
2. Dinosaurs appeared.
4. Small plants grew on the water.
6. Plants began to grow on dry land.
8. Water appeared on the earth.
10. The universe began with a "Big Bang".
12. Mammals appeared.
Put the sentences into the right order
Summary
After the “Big Bang”, the earth was just a cloud of ________. It ________ loudly with fire and rock, which were in time to produce the water _______, nitrogen,water vapour and other gases. Then small plants grew. They________ and filled the oceans and seas with_______,which encouraged the later development of early________and all sorts of fish. When the plants grew into forests, ________ appeared for the first time. They produced young generally by _____ eggs.

dust
exploded
carbon
multiplied
oxygen
Shellfish
reptiles
laying
Summary
when dinosaurs disappeared, ________ became more important. Small clever animals with ____________ appeared and ______ all over the world. As time went by they covered the earth and they are putting too much carbon dioxide into the __________, which ______ heat ______ escaping from the earth into space. Whether life will continue on earth for millions of years to come will ___________ whether this problem can be solved.
hands and feet
depend on
from
prevent
atmosphere
spread
mammals
Free talk
1. Since human beings appeared on the earth,what problems have caused by human beings?
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putting wasted air into the atmosphere
Causing greenhouse effect


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greenhouse effect and global warming
temperature rises
ice in the North Pole melts
Discussion
How to solve（解决） the problem of global warming?
Taking good care of the earth is taking good care of ourselves!
* Read the text aloud after the tape, paying attention to pronunciation, intonation and rhythm. Underline some important sentences.
* Retell the passage using about 100 words.
Homework