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必修三Unit4 reding 课件_图文

Unit4 How life began on the earth
青州五中 李小翠

Lead in ——

Let’s enjoy a short video together

Learning aims
? 1. To learn the important words and expressions. ? 2. To improve listening skills and reading

ability.
? 3. To arouse interest to search for the space

Warming up before Reading
1. ______ vi. 存在;生存 exist

大气层,气氛 6. atmosphere____________

multiply 2. _________vt. &vi. 乘;增加
3. _________ adj. 有害的 harmful 4.prevent…from阻止;制止 ______________

氧 7. oxygen __________ 出现, 发生 8. appear _____________ 发展 9. development __________
10. global warming 全球变暖 _________

depend on 5. ___________依赖;依靠

StepⅠ Skimming
Read the passage quickly and silently

finishing the following exercises

Question 1. Match the main idea with each paragraph
Paragraph 1 A: The importance of water for life

Paragraph 2 Paragraph 3 Paragraph 4
Paragraph 5

B: The arrival of humans and their
impact on the earth

C: A widely accepted theory about
the information of the universe

D: The formation of the earth
E: The development of plants and and animals

Question 2. According to the origin of life, we can divide
the whole passage into two stages. Please get the main

idea of each stage.
? Stage 1( para.1 to 3 )

earth The development of the _________ ? Stage 2( para. 4 to 5 ) life The development of _______ on the earth

Step Ⅱ Careful Reading Task1 Read Stage 1 and finish the

following exercises.

Q1: How did the universe begin? The universe began with a “Big Bang” ___________________________________________________ Q2: Why was water to be fundamental to the development of life? Because the continued presence of water
_____________________________________________________

allowed the earth to dissolve harmful ______________________________________________________ gases and acids into the oceans and seas _____________________________________________________

Q3: Can you fill the form now?
Time
Big Bang Between 4.5 and 3.8 billion years ago

What happened Atoms _________ began to form and combine to stars create _______ and other ________. bodies solid ● Dust settled into a ______ globe. ●The earth exploded to produce its atmosphere ________________. presence ●The continued __________ of water allowed the earth to dissolve harmful acids gases and _______ into the oceans and seas.

Task 2 Read Stage2, then finish the chart.

1. Small plants in water

2.Shellfish and ____________

all sorts of fish __________

insects 4. _______________
amphibians 5. _______________

3. Green plants on land

6. forests

7. reptiles 8. ____________ dinosaurs mammals 9. ____________ 10.human beings _________

Task 3 Read the whole passage again, then put the order of development of life into a time line.
(8 ) 1. The universeamphibians appeared. A: Insects and began with a “BigBang” ( ) 2. The earth was a cloud of dust 10 B: Dinosaurs appeared
( 3 ) 3. The earth became aasolid ball. C: The earth became solid ball. ( 5 ) 4. Water appeared on the the water. D: Small plants grew on earth. ( 9 ) 5. Small plants grew on the water. E: Reptiles appeared ( 7 ) 6. Shellfish and other fish appeared F: Plants began to grow on dry land.

( 2 ) 7. Plants began to a cloud of dust G: The earth was grow on dry land.
H: Water and amphibians appeared. 4 )8. Insects appeared on the earth. ( 6 ) 9. Shellfishappeared fish appeared I: Reptiles and other ( 1 ) 10.Dinosaurs appearedwith a “BigBang” J: The universe began ( K Clever animals with 12 )11.Mammals appeared hands and feet appeared (11) 12.Clever animals with hands and feet appeared L Mammals appeared (

Step Ⅲ Consolidation
Please finish the chart by yourself

Small plants were the start of changes. They ___________ and filled the oceans and seas with ______ which encouraged the _____________ of early shellfish and fish. Land animals such as insects、amphibians、 reptiles and dinosaurs and so on _________ after the first green plants appeared. But they didn’t ______ long on the earth for too long. Then dinosaurs disappeared, which made possible the ______ of mammals on the earth. Then small clever animals ____________ all over the earth

Big Bang

The earth was just a cloud of dust whose future is _________ after the “Big Bang”. Then the earth went trough a series of reactions, after which water ________. And people think it is important for the beginning of life. It allowed the earth to dissolve ________ gases. Then life began to develop. And human beings put too much carbon dioxide into the __________, which ________ heat_____ escaping from the earth into space. As a result, the problem of ______________ occurs. Whether life will continue on the earth for millions of years to come will ___________ whether this problem can be solved.

Big Bang

Small plants were the start of changes. They multiplied and ___________ filled the oceans and seas with ________ oxygen which encouraged the ________________ of early development shellfish and fish. Land animals such as insects、amphibians、 reptiles and dinosaurs and so on followed after the first green _________ plants appeared. But they didn’t exist _________ long on the earth for too long. Then dinosaurs disappeared, which made possible the ______ of mammals rise on the earth. Then small clever animals ____________ all over spread the earth

The earth was just a cloud of dust whose future is ___________ uncertain after the “Big Bang”. Then the earth went through a series of reactions, after which And human beings put too much appeared water ___________. And carbon dioxide into theit is important people think _____________, which ________ prevents atmosphere beginning of life. It for the heat_____ escaping from the earth from allowed the earth to into space. As a result, the problem dissolve harmful gases. __________ of global warming occurs. __________________ to develop. Then life began Whether life will continue on the earth for millions of years depend on to come will ____________ whether this problem can be solved.

主语从句
Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.

宾语从句

We should live in harmony with nature and all kind of animals

Homework 1. Retell the passage by yourself

2. Finish Exercise 3 on Page 27.