必修三Unit4-reading

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Unit 4: Astronomy:

the science of stars

telescope

astronomers

Astronomy is the scientific study of the universe and the heaven bodies (such as the sun, the moon, and stars), gas, and dust within it.

astronomer

Think about these questions and

then discuss them with your partner.

In our solar system

eight planets circle

around the sun. What

are they? Can you

match the names with

the planets?

1. Do you know the origin of life  on earth?2. Each religion or culture has its  own ideas about how life began  on earth.

How did life begin on earth?

In Chinese culture:

Pangu separated the sky and the earth;

Nvwa made human beings with clay(黏土).

How did life begin on earth?

In Western culture:

God created the world in 7 days.

On the 6th day, he created humans: Adam and Eve

All began with a “Big Bang ”(大爆炸)

How did life begin on earth?

According to a widely accepted theory,

The universe began from the Big Bang.

How Life Began on the Earth

Stage 1: The development of the earth

a cloud of dust

a solid globe

A cloud of dust

A solid ball

Atmosphere

water appeared

dissolve harmful gases

The earth was just a cloud of dust whose future is _________ after the “Big Bang”. Then the dust began to settle into a _______ ball which is so ________ and _______ loudly with fire and rock, to be in time to produce many things, which made the earth’s ___________. As the earth cooled down, ________ began to appear and people think it is important for the beginning of life. It allowed the earth to dissolve ________ gases. Then life began to develop.

uncertain

solid

violent

exploded

atmosphere

water

harmful

? ? ?

I felt lonely and life was dull at that time.

Water Air Life

Water is the headspring of life.

?

Development of life:P4-5

1. After water appeared___________ appeared on the surface of the water, which encouraged the development of ____________________

small plants

shellfish and all sorts of fish

2. Next, ___________ began to grow on land as well as land animals-------insects and ___________, which can live both on land and in the water.

green plants

amphibians

3. Later, when plants grew into forests, ______ appeared for the first time. Some huge animals, called _________, developed, they produced young by laying eggs.

reptiles

dinosaurs

About 65 million years ago, dinosaurs disappeared, after that, _________ became more important.

mammals

came into being and spread all over the world.

What life developed after mammals?

Humans

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.

What problems have been caused by humans to 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 .

Man has but one earth!

To save the earth is to save man himself!

our

home

How to protect the earth and make it a better place to live on?

solar energy

plant trees

recycle rubbish

prevent desertification

save water

purify air

ride bikes or take a bus or walk to school

plant trees

save water

What can we do

for taking care of the earth?

Possible answers:

save electricity

join Earth hour

use recyclable products

save paper

reduce rubbish

Only if we understand can we care;

only if we care will we help;

only if we help shall all be saved.

——Jane Goodall

唯有了解，我们才会关心 ；

唯有关心，我们才会行动；

唯有行动，生命才会有希望。

——珍妮XXXXX古道尔

Homework

Collect more information about the development of life and make a poster with your group members.

2. Read and retell the passage to learn the important and difficult language points.[全文已结束，注意以上仅为全文的文字预览，不包含图片和表格以及排版]

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