Unit 4: Astronomy

Reading : How Life Began On the Earth

What have you seen in the video?

amphibian(s)

reptile (s) mammal (s) human (s)

simple cells shellfish

Each religion and culture has its ownideas about how life began on earth.

What ideas do you know?

Ideas about how life began on the earth

Idea 3: God created the world.

Idea 1: Pangu created the world.

Idea 2: Nuwa made human beings.

the evolution of lifethe formation of the earth

How Life Began on the EarthPrediction:

What’s the writing style of the passage?

A.narrative writing ( 记叙文） B.expository writing ( 说明文） C.argumentative writing （议论文）D.news report

Skimming:

the formation of the universe

the development of life(Para 2,3,4)(Para 5)

part 1

part 2

main idea?

(Para 1)

part 3 the impact of human beings on the earth

Scanning:

The universe began with__________.The earth began with__________.

A. a cloud of dust B. small plants C. a Big Bang D. dinosaurs

C

A

Read from the illustration( 插图）

Did life appear on land or in the water first? Why?line19: It was not immediately obvious that waterwas to be fundamental to the development of life.

small plants in watershellfish and all sorts of fish

insects

reptiles

amphibians

mammalsdinosaurs

humans

plants animals

green plants on land

forests

first next

later

after that

finally

How did plants and animals develop?para4, 5

Reading for speaking:

M: Hi,Tom. I’m really confused about the development of life. What appeared first?T:Well. It’s small plants that appeared first .M:Why was that?T:They can produce oxygen, which…M:Next, what plants began to grow?T: …M:Later, when…T:…M:After that,…T:…M: Finally…T:…

Discussion:The impact of human beings on the earth:

Positive Negative

nuclear pollution global w

arming

report

• According to the following linking words to give a report and the impact of human being on the earth.

• first, next, later, after that, before long,

• finally, in a word.

Save the earth!

1. Finish Ex.4 on P27 on Student’s book.

2. Go over the passage and pick out useful words and phrases .

Homework