Unit 4: Astronomy
Reading : How Life Began On the Earth
What have you seen in the video?
simple cells
shellfish
amphibian(s)
reptile (s)
mammal (s)
human (s)
Each religion and culture has its own
ideas about how life began on earth.
What ideas do you know?
Ideas about how life began on the earth
Idea 1: Pangu created the world.
Idea 2: Nuwa made human beings.
Idea 3: God created the world.
Prediction:
How Life Began on the Earth
the formation of the earth
the evolution of life
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:
main idea?
part 1 (Para 1) the formation of the universe
part 2 (Para 2,3,4) the development of life
part 3 (Para 5)
the impact of human
beings on the earth
Scanning:
C
The universe began with__________.
The earth began with__________.
A
A.
B.
C.
D.
a cloud of dust
small plants
a Big Bang
dinosaurs
Read from the illustration(插图）
Did life appear on land or in the water first? Why?
line19: It was not immediately obvious that water
was to be fundamental to the development of life.
How did plants and animals develop?para4, 5
animals
plants
first
small plants in water
green plants on land
shellfish and all sorts next
of fish
later
insects
amphibians
reptiles
forests
after that
finally
dinosaurs
mammals
humans
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
warming
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!
Homework
1. Finish Ex.4 on P27 on Student’s book.
2. Go over the passage and pick out useful words
and phrases .