人教课标版 人教课标版 高一必修高一必修 3 3

Unit 4Unit 4

人教课标版 人教课标版 高一必修高一必修 3 3

Unit 4Unit 4

Reading

HOW LIFE BEGAN ON THE EARTH

Warming up

What are the names of the eight planets that circle our sun?

海王星 Neptune

水星Mercury

金星Venus

地球Earth

火星Mars

木星Jupiter 土星

Saturn

天王星Uranus

A Quiz Game

1. How old is the earth?

A. About 3.5 billion years

B. About 4.5 billion years

C. About 5.5 billion years

D. About 6.5 billion years

2. ______ of the earth surface is covered

by water.

A. 20% B. 30% C. 50% D. 70%

3. How many planets are there in the Solar

System?

A. 6 B. 7 C. 8 D. 9

4. What is the total population of humans

on the earth?

A. About 3.5 billion B. About 4.5 billion

C. About 5.5 billion D. About 6.5 billion

5. How long does the rotation ( 自转 ) of the earth take? A. 12 hours B. 24 hours C. a month

D. 365 days6. Which continent is the smallest? A. Africa B. North America C. South America D. Oceania 7. On what day is the Earth day celebrated? A. April 22 B. May 4 C. August 21 D. November 11

8. Which ocean is the largest?

A. The Pacific Ocean

B. The Arctic Ocean

C. The Indian Ocean

D. The Atlantic Ocean

9. Which country has the largest area?

A. Canada B. China

C. Russia D. U.S.A

Prediction Look at the picture. Do you know the topic of this unit?

海洋里的细胞开始分裂

登陆登陆

爬行动物

恐龙恐龙

Mammals

人类的兴起

Do you know what it was like

before life appeared on earth?

可以演化成低级生命的小液滴水泡状的太空原始生命体

It was full of water.

1. What do we mean when we say we are

studying a subject scientifically? Or

what’s the correct attitude towards

science?

We should be objective, not

superstitious.

2. What’s the correct way to prove a

scientific idea?

We should design experiments to

test it for several times.

Then we can analyze the results and

draw a conclusion at last.

3. What are the most important skills

we need to be real scientists?

Careful, objective and logical, draw

conclusions from the experiments

and not impose conclusions on the

data.

(impose…on… 把…强加于… )

1. The origin of life on earth is a question that interests astronomers. What do you know about it?

How old is the universe? (several billion years ago)

How old is the Earth? (between 4.5 and 3.8 million years ago)

Which were the first creatures or plants on Earth?...

Pre-reading

2. Each religion and culture has its

own ideas about how life began on

earth. What do you know?

In China, we all know that Pangu

separates the sky from the earth

and Nvwa made humans.

Pangu separates the sky from the earth.

中国神话传说中有盘古开天地的说法。巨人盘古用一把利斧劈开混沌 , 将天地分开。死后 , 他的气息化成风和云 , 声音变成轰轰的雷声 , 左眼化为太阳 , 右眼化为月亮 , 手足与四肢变成大地的四极与五方的名山 , 血液化成江河 , 筋脉铺成道路 , 肌肉形成田地 , 须发成为星星 , 牙齿和骨骼化为金属、珍珠、玉石 ,

汗水成为滋润万物生长的甘霖和雨露。

Nvwa made humans.

Other legends about the beginning of

universe.

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.

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.

India

Brahma is the god

first represented in the

Hindu Triad. He is the

creator of the universe

and all living beings are

said to have evolved

from him.

▲Big Bang

Gas New stars

Dying starsremnants

平面图

太阳系

地球大气

1. When did the “Big Bang” happen?

It happened several billion years

ago.

Scanning

Read the passage quickly and answer the questions.

2. What form was the earth 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. How did water come into being on

the earth?

As the earth cooled down after it

exploded, water came into being.

5. 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.

6. What was important to the development

of fish?

oxygen.

7. What made possible the rise of

mammals on the earth?

The disappearance of dinosaurs made

the possible the rise of mammals on the

earth.

8. Why are mammals different from all

life forms in the past?

They gave birth to young baby

animals and produced milk to feed

them.

Finish the Exercise 2 on the book according to the questions above.

Close reading

I. Read the passage carefully 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.

II. Answer the following questions.

1. Why was the earth different from other planets?

The water remained.

2. Why did the plants grow before the animals came?

Because plants provide oxygen for animals to breathe.

3. Why is it wrong in films and stories

to show dinosaurs and people

together?

Because dinosaurs died out long

before human beings developed on

the earth.

4. Why do you think that humans are the

cleverest animals on the earth?

They are the cleverest animals because

they have larger brains than any other

creature on the earth so far.

5. There used to be nine planets in the

solar system. Recently scientists have

decided that one of them can no longer

be considered a planet. Do you know

the name of that planet? Do you know

why they removed it?

Pluto. Scientists now think it is too

small to be called a planet.

6. What problem is caused by human

beings?

They cause global warming.

III. Fill in the blanks in the following form.

Time What happened

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

Atoms

Between 4.5 and 3.8 billion years ago

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

violent

atmosphere

presence

acids

Many millions of years later

●The first small plants on the surface of the water produced _______.●Early _______ and all sorts of fish appeared.●Green plants began to grow on land. ●Insects and ___________ appeared.

oxygenshellfish

amphibians

Many millions of years later

●________ appeared and they laid eggs.●Dinosaurs developed, laid eggs and _______ for more than 140 million years.●Mammals rose and ____________ babies.

Reptiles

existed

gave birth to

About 2.6 million years ago

●Some small ______ animals with hands and feet appeared and spread all over the earth.

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

clever

dioxide

IV. True (T) or False (F).

1. The earth appeared before the Big

Bang happened.

2. The original atmosphere consisted of

nitrogen and oxygen.

3. The main difference between the

earth and other planets is that there

is water on the earth.

4. Life began in water and then on land.

F

F

TT

5. Mammals appeared before the development of dinosaurs.

6. Dinosaurs could give birth to young baby animals and produced milk to feed them.

7. Human beings produce too much carbon dioxide which causes the global warming on the earth.

8. According to the text, human beings would disappear in the end.

F

F

T

F

How life began on the earth.

“Big Bang”

other bodies________ stars

Earth: a cloud of _____

atoms

dust

Summary

a solid _____

the earth’s _____________

other 4. _____

Water: ____________ to the development of life

water vapour nitrogen carbon

extremely small _______ on the surface of the water

globe

gases

atmosphere

fundamental

plants

early _________ and all sorts of fish

green plants on land

land animals insectsamphibians

___________

huge animals (dinosaurs) the rise of __________

human beings

shellfish

reptiles

mammals

We have We have only one only one earth!!!earth!!!

Speaking

What should we do for our earth?

You can use the following words or

phrases to help you:

prevent… from… harmful global

warming carbon dioxide in turn

depend on as a result thus

atmosphere

Speaking

What should we do for our earth?

Let’s take part in the activities to

save the earth!

How life began on earth is one of the

biggest puzzles that scientists found

hard to solve. What other puzzles

are hidden in the passage? Find

them out and do some research.