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必修三Unit4


Unit 4
Astronomy: the science of the stars
Zoe. Zou Dongpu Middle School

What do you know about astronomy? Astronomy is the scientific study of the universe and the heav

en bodies (such as the sun, the moon, and stars), gas, and dust within it.

In our solar system there are eight How many planets circling around the planets circling around the sun. Look atsun the are there inare our solar Can system? picture. What they? you match the names with the planets?

Uranus 天王星 Venus 金星 Earth Mars 火星 Mercury 水星 Jupiter 木星 Neptune 海王星 Saturn 土星

Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune

Is there life on the planets?

Yes, there is life only on the earth.
Then how did life began? Each religion and culture has its own

ideas about how life began on earth.
What do you know ?

How about in China?

How about in the west?

Pangu separated Nvwa created the sky humans
盘古开天 女娲造人

God created the world
上帝创世论

Are they true for the beginning of the life? Do you know what a scientific idea is?

How Life Began on the Earth

How

LIFE BEGAN

?

ON THE EARTH

Read the title and look at the pictures. Predict what the reading will be about? It is about how life began on the earth.

Skimming
Read the passage as listening to the tape, and then answer the following questions.

Questions:
1. How did the universe begin according to a widely accepted theory?

2. What was produced when the earth exploded? 3. Why is water important on the earth?
4. Why did plants grow before animals came?

5. Why were mammals different from other life forms?
6. What’s the problem with the earth now?

1. How did the universe begin according to a widely accepted theory? (Para.1)The universe began with a Big Bang.
2. What was produced when the earth exploded? (Para.2)Carbon, nitrogen, water vapour and other gases.

3. Why is water important on the earth? (Para.3)It allowed the earth to dissolve harmful gases and acids into the oceans and seas.

4. Why did plants grow before animals came? (Para.4)Because green plants can take carbon dioxide from the atmosphere and fill the air with oxygen.
5. Why were mammals different from other life forms? (Para.4)Because they gave birth to young baby animals and produced milk to feed them. 6. What’s the problem with the earth now? (Para.5)The earth may become too hot to live on.

Scanning
Read the passage again and put the order of development of life into a timeline according to the reading passage.

1. Insects and amphibians appeared. 2. Dinosaurs appeared. 3. The earth became a solid ball.

4. Small plants grew on the water.
5. Reptiles appeared. 6. Plants began to grow on dry land. 7. The earth was a cloud of dust. 8. Water appeared on the earth.

9. Shellfish and other fish appeared.
10. The universe began with a “big bang”. 11. Clever animals with hands and feet appeared 12. Mammals appeared.

Lets review the development of life.

Para.1

Big Bang Atoms

Para.2

Earth: a cloud of dust

A solid globe

Water

The earth’s atmosphere

Para.3

Water: fundamental to the development of life

Para.4

Green plants on land

Small plants on the surface of the water

Early shellfish and all sorts of fish

Land animals

Reptiles

Huge animals The rise of mammals (Dinosaurs)

Para.5
Clever animals with hands and feet (Human beings)

1. Insects and amphibians appeared. 2. Dinosaurs appeared. 3. The earth became a solid ball.

10 7 3 8

9

4. Small plants grew on the water.
5. Reptiles appeared. 6. Plants began to grow on dry land. 7. The earth was a cloud of dust. 8. Water appeared on the earth.

6
1 5

9. Shellfish and other fish appeared.

4

2
12
11

10. The universe began with a “big bang”. 11. Clever animals with hands and feet appeared 12. Mammals appeared.

Further reading
Base on the above exercises and analyse the structure of the text. Write down the main idea for each paragraph.

accepted theory about Para 1: A widely Part 1.Lead-in the formation of the universe.
Main Body Para 2: The formation of the earth. Para 3: The importance of water for Part 2.Development oflife. life Para 4: The development of plants and

animals on the earth.

The arrival of humans and their Part 3.Ending Para 5: impact on the earth.

Time

What happened

Atoms began to form and Big Bang ______ combine to create stars and other bodies.

Between 4.5 and 3.8 billion years ago

● Dust settled into a solid violent globe. and ______ ● The earth exploded to atmosphere produce its ___________. ● The continued presence of water ________ allowed the earth to dissolve harmful gases acids into the oceans and _____ and seas.

Many ● The first small plants on millions of the surface of the water oxygen years later produced _______. shellfish and all ● Early ________ sorts of fish appeared. ● Green plants began to grow on land. amphibians ● Insects and ___________ appeared.

Reptiles appeared Many millions ● ________ of years later and they laid eggs. ● Dinosaurs developed, laid eggs existed for more and _______ than 140 million years. ● Mammals rose and gave birth to ____________ babies.

clever About 2.6 ● Some small ______ million years animals with hands ago and feet appeared and spread all over the earth.

Now

Humans produce too dioxide much carbon _______, making the earth too hot.

We have only one earth!
We should take care of the earth!

ks5u精品课件

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

Possible answers:

What can we do for taking care of the earth?
use recyclable products save water

plant trees
reduce rubbish save paper join Earth hour

save electricity

ride bikes or take a bus or walk to school

Only if we understand can we care;
唯有了解,我们才会关心 ;

only if we care will we help;
唯有关心,我们才会行动;

only if we help shall all be saved.
唯有行动,生命才会有希望。

——Jane Goodall
——珍妮· 古道尔

1. Read the passage after class and underline the language points you don’t understand in the text.

Thank you very much.

Good bye!


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