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人教版英语必修三unit4公开课课件 原创


welcome
Senior Grade 1 Class 20 Cai Yan

Astronomy: the science of the stars

?

unit4

What's astronomy?
It is the scientific study of

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

? eight planets ? many comets (彗星

The Solar System

)

? other objects

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

Uranus['ju?r?n?s] Mercury['m?:kjuri] Jupiter['d?u:pit?]
Neptune['neptju:n] Saturn ['s?t?n] Venus Mars Earth

金星 火星 Venus Mars 水星 地球 Mercury Earth Jupiter

木星

天王星 Uranus 海王星 土星 Neptune Saturn

Under the Dome

How Life Began on the Earth

What happened to our earth?

Task 1

Watch and Match

Main idea of each paragraph
Paragraph 1: Paragraph 2: a. The importance of water for life b. The development of plants and animals on the earth c. The formation of the earth d. The arrival of humans and their impact on the earth e. A widely accepted theory about the formation of the universe

Paragraph 3: Paragraph 4: Paragraph 5:

?Task

2 Scanning

?Work

in pairs. Get famililar with the development of life according to the passage.

the evolution(演化) of life on the earth

Stage 1 The development of the earth

Stage 2 The development of life in water
Stage 3 The development of life on land Stage 4 The development of humans

The development of life

Stage 1: The development of the earth(para 13)

The big bang
a cloud of ______ dust globle a solid ______ water __________ Life began appeared produced CO2, N2, exploded fire and rock with___________ Cool down water vapor and other gases

atmosphere

The development of life(para4-5)

Stage 2: The development of life in water

First
extremely small oxygen plants

early shellfish What kind ofof life and all sorts appeared? fish

Stage 3: The development of life on land

Next
green plants _____________on land

followed by

15

Later _____________ land animals appeared.

insects
amphibians

16

Green plants grew into forests ______

Later

(1) What life developed after forests appeared?
After that

When plants grew into forests, reptiles ______ appeared for the first time.

18

Some huge animals, called _________, dinosaurs developed.

When dinosaurs disappeared, _________ mammals became more important.

(2) What life developed after dinosaurs?

(3) What life developed after mammals? Finally small clever animals

Humans came into being and spread all over the world.

The sequence of development of life on the earth
water extremely small plants

shellfish fish

land plants

reptiles

forests

amphibians land insects

dinosaurs

mammals clever animals

humans

Consolidation
the Main Idea of the text formation ?The text mainly tells us the ___________ of the earth and the ______________ of development life on it. ?2. Text Retelling
?1.

Deep Analysis
?

too much carbon

?

dioxide(CO2)

greenhouse effect
(温室效应)

global warming(全球变暖)

The earth is getting warmer and warmer

the impact of glombal warming
1. sea level rise

2. the fall in food production
3. the severe and extreme weather

4. disappearance of specials
5. the spead of diseases

Discussion

?What

should we do to prevent the global warming?

Solutions

1. Reduce

Reuse

Recycle

2. Create green homes and buildings 3. Drive less per week by using public transport, bicycles or walking.

4. Plant more trees

Assignment
?1.

Try to retell the passage in your own words. ?2. Complete the composition.


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