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必修3第四单元英语教案

2017-09-22 11:26英语教学课件 浏览:

必修3第四单元英语教案

Unit4  Period 2  How Life Began on The Earth

学习目标:1. To learn about the origin of life on the earth.
2. To master the usages of some key language points.
3. To develop the feeling of treasuring the earth and life.
学习重点1.Words: ①explode ②multiply ③spread
          2.Expressions:①whether … or not ②in time to do sth ③allow … to do ④in one’s turn ⑤prevent … from
学习方法:自主探究;小组研讨
学习过程
Ⅰ.Knowledge link
In our solar system eight planets circle around the sun.   Do you know them?
必修3第四单元英语教案
Ⅱ. Reading

  1. Fast-reading

Main idea of each paragraph
Paragraph 1                  The importance of water for life
Paragraph 2      The development of plants and animals on the earth
Paragraph 3      The formation of the earth
Paragraph 4                A widely accepted theory about the formation of the universe
Paragraph 5      The arrival of humans and their impact on the earth
2. Careful-reading
Read the passage carefully and then put the order of development of life into a timeline.
A. Insects and amphibians appeared                      B. Dinosaurs appeared
C. The earth was a cloud of dust                  D. Water appeared on the earth
E. The universe began with a “Big Bang”           F. The earth became a solid ball
G. Small plants grew on the water                 H. Mammals appeared
I. Clever animals with hands and feet appeared       J. Reptiles appea
Order:_________________________________________________________________________

Crazy English: (Read the sentences loudly)
1.According to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all directions.
2.The earth became so violent that it was not clear whether the shape would last or not.
3.What is even more important is that as the earth cooled down,water began to appeared on its surface.
4.It was not immediately obvious that water was to be fundamental to the development of life.
5.This produced a chain reaction, which made it possible for life to develop.
6.Why they suddenly disappeared still remains a mystery.
Ⅲ.Learning about language
1.explode vt.: 使爆炸爆发;破除(迷信等),戳穿,驳倒
explore vt.: 探究探索,钻研考察

  1. multiply vt.: ①增加,繁殖 Rabbits multiply rapidly.②乘,使相乘 5 multiplied by              4 equals 20. 5乘以4等于20.
  2. spread vt. : 伸展;延伸;展开;传播

spread oneself 舒展四肢  spread over 延续

  1. They were in time to produce carbon, nitrogen.

in time to do sth: 及时去做…;in time to sth合拍子,按节奏
Ⅳ. Exercise café

  1. Hearing his son hurt badly by a stranger, the man ________ with anger.

A  explored  B  exposed  C  exploded  D  explained
2. Knowledge is _______ much more quickly on the Internet than ever before.
A  spreading  B  carrying  C  developing  D  growing
3. Don’t worry. She will be back _______ to prepare dinner.
A  on time  B  in time  C  at time  D for time
4. A: Our parents won’t allow us to drive their car.
B: Our parents ________ us ________ _________ their car.
5.A:You’ll feel sorry sooner or later for what you’ve done to her.
B: You’ll feel sorry for what you’ve done to her ________ _________
Ⅴ. Consolidation (巩固)      How life began on the earth?  

必修3第四单元英语教案  
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