人教版高中英语必修三Unit 4Astronomy: the science of the stars Reading 课件 （共19张）

课件19张PPT。Unit 4 Astronomy:
the science of the starsastronomerHow life began on the earth?进化(MTV).flvQuiz on earth life.1 Do you know which one is not a mammal哺乳动物?2 Snakes and tortoises belong to
_____,while frogs and toads
belong to__.
A amphibians 两栖动物
B reptiles爬行动物 A BkoalaWater Air Life
?3 How Life Began on the Earth：Which came first ?How Life Began on the EarthReading.mp3
A widely accepted theory about the formation of the universe The formation of the earth The importance of water for life The development of plants and animals on the earth The arrival of humans and
their impact on the earthMatch the main idea of each paragraph.Fast reading
True or false
1. According to a widely accepted theory, the universe began with a “Big Bang”, after which the earth was still a cloud of dust for several billion
years.
2. As the earth cooled down, water began to appear on its surface.
3. Water allowed the earth to dissolve harmful gases and acids ,and it only appeared on the earth.
4. As for mammals , they produced young generally by laying eggs.
5. Clever animals with hands and feet,
in their turn, are protecting the earth well
instead of other less important animals.
Detailed reading Competition!News conferencePlace： News conference 记者招待会
Event：Ten astronomers answer questions
Topic ：How life began on the earth
Rules :
1.Girl group and Boy group
2. Five students of each group come to the front to compete for answering questions made by the rest students.
Scores : Five scores each time
Notice: Who wins will get gifts!Gift 1 Gift 2 1 What happened after Big Bang?
2 What happened between 4.5 and 3.8 billion years
ago ?
3 What were to make the earth’s atmosphere?
Why water was important for making it possible
for life to develop?
Did plants appear first or animals come first?
And why?
Which turned up first: reptiles,mammals or
amphibians?
7 What’s the difference between mammals and reptiles?
8 Did air appear earlier than water and life?
9 What are human beings doing at present?
Reference questions:Gift 1 Gift 2 Gift 1 Gift 2 Cheer up !
All of you have done a good job!
We all know our earth is changing worse and
worse,then what should we do to protect it?
Now let’s share Michael Jackson’s feelings
toward this problem !
Earth song
Extension
Write a composition about protecting our earth.Thanks for your listening!Astronomy is the scientific study of the universe and the heaven bodies (such as the sun, the earth ,the moon), gas, and dust within it.
天文学是对宇宙及其内部的天体、气体和尘埃所做的科学研究。