Unit4How_life_began_on_the_earth 优秀公开课课件

the earth ______ down
cooled
water
Filling exercise(Para.4)(7) How life began on the earth water
plants in water 1.small ________ human beings 11.____________
Para.2
1. What is the originalearth源自s atmosphere made
up of?
carbon, nitrogen, water vapour, and other gases
Para.2
Fill in the blanks:
The origin of life on the earth is an interesting theory that question. It was a widely accepted ________ the universe began with a “Big Bang”, after a cloud of dust which the earth was _________________. Between 4.5 and 3.8 billion years ago it settled violent into a solid globe ______. The earth was very_______ and exploded loudly with fire and rock. they were in time to produce carbon, nitrogen, water vapor and other gases, which were to make the earth’s atmosphere Then as the earth cooled down, _____________. water appeared.
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖
类）
7.mammals(哺乳类)
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups . 1.insects
1.insects
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖
类）
7.mammals(哺乳类)
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups . 1.insects
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖
Human beings 类）
7.mammals(哺乳类)
Para.5
Use the sentence in the text to describe the picture: They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.
What’s the main idea for each Para? The development of plants and Para.1
animals on the earth
Para.2 Para.3
The importance of water for life The arrival of humans and their impact（影响） on the earth The formation(形成) of atmosphere and water on earth
Para.4 Para.5
A theory about how the universe began
Task3 Careful reading
Para.1
Judge True or False
To be honest, none of us knows how the earth began because it happened too long ago.
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖
类）
7.mammals(哺乳类)
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups . 1.insects
Para.4
Look at the pictures and tell the groups .
1.insects 2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖类）
7.mammals(哺乳类)
Study of the groups of life Look at the pictures and tell the groups .
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖
类）
7.mammals(哺乳类)
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups . 1.insects
shellfish and all sorts of fish 2._________ 3. green plants on land
10.small clever animals with hands and feet ______________
4. insects (on land) amphibians land and in water) 5._____________(on reptiles (on land) 7._________ 8. dinosaurs (on land) forests 6. mammals(on land) 9._________
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖
类）
7.mammals(哺乳类)
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups . 1.insects
How life began on the earth
Saying 1
separated Pangu __________the sky from the earth.
盘古开天辟地
Saying 2
Nuwa mended the heaven and created _________human beings.
女娲补天
Saying 3
created God _________the world in seven days.
Saying 4
monkey The development of Human from________
Saying 5
Life was brought to the earth outer by ET from ______space.
Questions: 1) How did water come into being on the earth?(Para.2)(2) The explosion of the earth produced water vapour, which turned into water when the earth cooled down. 2) Why is important to have water on the earth?(Para.3)(2) It allowed the earth to dissolve harmful gases into oceans and seas.
True
Para.1
How did the Big Bang create the universe?
First of all , directions it _____ threw matter in all _________. After that , atoms began to ________. ______ form Then, stars atomscombined ______ to create _____and ___________ other bodies .
greenhouse effect
The earth may become too hot to live on .
Para.5
Summary
2.6 million years ago some Finally about____ small_______ clever animals__________, appeared but they put lots of carbon into the atmosphere, _____________ preventing heat escaping from the earth into space. As a result of it, life on earth is i____d___________. n anger
Task1 Fast reading
Read the passage quickly and find out the answers to the questions below. 1. What does the text tell us?
How the earth come into being The problem of the earth caused by human being How the human being build the earth How the life developed on the earth
Group competition
3
1
4
5 6
Filling exercise(Para.1-2)(6) How the earth came out
Big Bang
ball/globe a solid _______ dust a cloud of _____
slowly combine
fire rock it exploded loudly with _____ and _____ atmosphere the earth’s ___________
D. It was the oldest planet.
Para.3
2. How did water help life develop? Water allowed the earth to dissolve harmful gases __________ and acids into the oceans and seas, producing chain reaction a_______________.
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish
6.amphibians（两栖
类）
7.mammals(哺乳类)
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups . 1.insects
Para.3
1. What makes the earth different from the other planets in the solar system?
A. It produced a lot of heat. B. The continued presence of water
C. Water disappeared.
Task1 Fast skimming reading
• 2.How did the universe begin according to a widely accepted theory?
The universe began with a Big Bang.
Task1 careful Task2 skimming reading