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英语必修3 Unit 4 Astronomy---The Science of The Stars 课件


Unit 4

solar system
太阳系

Sun Earth Mars Saturn Jupiter Uranus Neptune
But scientists now Pluto think Pluto is too small to be called a planet.

B

ig Bang

HOW LIFE BEGAN ON THE EARTH?

Scanning
Scan the passage quickly to answer the following questions. 1. What is the original earth’s atmosphere made up of? 2. What is the fundamental to the development of life? 3. Which kind of life-being first appeared on the earth, plants or animals? 4. Main idea of each paragraph

1. What is the original earth’s
atmosphere made up of?

carbon, nitrogen, water vapour, and other gases
2. what is fundamental to the development of life?

Water

3. Which kind of life-being first appeared on the earth, plants or animals? 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.

4.Choose the main idea for each paragraph

(5 )The arrival of humans and their impact on the earth. (2 )The formation of the earth.
(4 )The development of plants and animals on the earth. (1 )A widely accepted theory about the formation of the universe. (3 )The importance of water for life.

Passage structure
Read the passage carefully and analyse its structure:
A widely accepted theory about the Para 1: earth, atmosphere and water formation of the universe.

Main body

Para 2: The formation of the earth. The development Para 3: life importance of water for life. Para 4: The development of plants and animals on the earth. The arrival of humans and Para 5: Human beings earth. their impact on the

Detailed reading
? ? ? ? ? ? ? ? ? ? ? ?

Put the order of development of life into a time line. 8 ( )A Insects and amphibians appeared. (10 Dinosaurs appeared. )B (3 )C The earth became a solid ball. (5 )D Small plants grew on the water. (9 )E Reptiles appeared. (7 )F Plants began to grow on dry land. (2 )G The earth was a cloud of dust. (4 )H Water appeared on the earth. (6) Shellfish and other fish appeared. I ( )J The universe began with a “Big Bang”. 1 ( )K Clever animals with hands and feet appeared. 12 ( )L Mammals apeared. 11

Post reading After reading the passage, discuss the following questions.
1. Why was the earth different from the other planets? Because the water remained on the earth. 2. Why is it wrong to show films with dinosaurs and people together? Because dinosaurs died out long before human beings developed on the earth.

Post reading After reading the passage, discuss the following questions. 3. What problem is caused by human beings?
Human beings causes global warming.

Lets review the evolution of life on the earth.

After the “Big Bang”, the earth was full of water.

Original cells appeared in the ocean.

The cells in the water began to separate. Marine animals came into being.

Some animals (amphibian & insects) came to land.

Reptile appeared.

dinosaurs

Mammals

Man had evolved from apes.

They developed new methods of growing food, hunting and moving around. As time went by they covered the earth and have become the most important animals on the planet.

Discussion
A We are making the world better.

B We are making the world worse.

(1) What humans developed? developed new methods of growing food
developed new methods of hunting developed new methods of moving around

(2) But they are not taking care of the earth very well. What problem are humans Greenhouse effect causing ?

putting carbon dioxide into the atmosphere

the earth may become too hot

As a student, what little things can we do for the earth?

solar energy

plant trees

prevent desertification

recycle rubbish

save water

purify air

Whether life will continue on the Only if we care will we help, earth depends on human beings. only if we help shall all be saved!

Assignment:

1. Collect more information about the development of life and make a poster with your group members.
2. Read and retell the passage.


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