课件15张PPT。Unit 4: Astronomy: the science of the stars
Warming up and readingWarming up Brainstorm: What words do you think of
when we talk about the following topic?
astronomyplanetstar universesatellitespacespaceshiptelescopeastronaut…ReadingHOW LIFE BEGAN ON THE EARTH?
What do you want to learn from the passage?
When…?
Where…?
What…?
How…?
Scanning 1.Where did life first begin, on the land or in the sea?
2. Which one appeared on the earth first,
plants or land animals?
watergreen plants on land23
4How life began on the earthAnalysing 5
6
7
8forestsshellfish and all sorts of fishinsects (on land)
amphibians (on land and in water) reptiles (on land)
dinosaurs (on land)
mammals (on land) small clever animals with hands and feet
human beings small plants in water1Text Retelling The explosion of the earth produced_____ ______, which turned into water when the earth cooled down. Water allowed the earth to _________ harmful gases into the oceans and seas. That made it possible for _____ to begin to develop.
The arrival of small _____ encouraged the development of early _______ and all sorts of fish. Many millions of years later the first green plants began to appear on land. watervapourdissolvelifeplantsshellfishLater land animals appeared. Some were_______. Others, called_________, were able to live on land as well as in the sea. When the plants grew into forests, __________appeared for the first time. Then ________developed, which became the most important animals on the earth for millions of years. After they disappeared, ________ became more important. Text RetellinginsectsamphibiansreptilesdinosaursmammalsThey were the last group of animals and they were different because they ______ their young from within their bodies. Small clever animals, with hands and feet, ________ and _______ all over the earth. As time went by, they covered the earth and have become the most important animals on the planet.Text Retellingproducedappearedspreadpair work:
If you are a guide, showing tourists around the science museum, tell them as much as you know about how life began on the earth.You can begin like this:
Ladies and gentlemen, welcome to the science museum…
You can end this way:
I hope you’ve known more about how life began on the earth and wish you a pleasant stay here. After the visit, the class decided to hold an exhibition named “Life and the Earth”. Each group of four is asked to design a poster(海报).
(1). Slogan(口号)
(2). Introduction
(3). Suggestions
Group work self-reflection and assessment Tell yourself what you have learntAny questions?1.in timeHow to …How to …Homework 1.Read the passage and try to underline all the long sentences.
2. Surf the Internet :find out more information about life and space. Thanks for attending !