北师版（2019）必修第二册Unit5 Humans and nature Viewing Workshop 课件(共23张PPT)

(共23张PPT)
Viewing Workshop
UNIT 5
HUMANS AND NATURE
By the end of this period, students will be able to:
read and talk about the universe;
watch for understanding;
summarise information.
CONTENTS
Pre-viewing
I
While-viewing
II
Post-viewing
III
Pre-viewing
1. How many stars are there in the galaxy
2. How many stars are there in the universe
observable
billion
expand
multiply
equivalent
incomprehensible
bewildering
edge
stupendously
horizon
adj. 可观察到的
num. 十亿
v.扩大
v. 乘
adj. 等同的
adj.不可思议的
adj. 令人困惑的
n. 边，边缘
adv. 巨大地；惊人地
n.地平线 ；视野
Learn some new words.
While-viewing
Activity 1: What do you know about the universe Complete the quiz with the right numbers.
13.8 billion
93 billion
46 billion
1. The universe is about ________________ years old.
2. The observable universe is about _____________ light years across in diameter.
3.Today the distant objects like stars that we can observe are a bit more than ______________ light years away.
Activity 2: Watch the first part of the video. Check your predictions from Activity 1.
13.8 billion
93 billion
46 billion
1. The universe is about ________________ years old.
2. The observable universe is about _____________ light years across in diameter.
3.Today the distant objects like stars that we can observe are a bit more than ______________ light years away.
Activity 2: Watch the first part of the video. Check your predictions from Activity 1.
Check your answers one by one.
1. The universe is about ________________ years old.
13.8 billion
2. The observable universe is about _____________ light years across in diameter.
27.5
billion
93
46 billion
3.Today the distant objects like stars that we can observe are a bit more than ______________ light years away.
Questions Observable Universe Whole
Universe
1. How big is it
2. Is there an edge
3. Is there a centre
4. Is it getting bigger
Activity 3: Watch the rest part of the plete the table.
1. How big is it
Observable
Universe
Whole Universe
About 93 billion light years across in diameter.
Probably infinite
Check your answers one by one.
2. Is there an edge
Observable
Universe
Whole Universe
Yes.
No.
3. Is there a center
Observable
Universe
Whole Universe
Yes. You.
No.
4. Is it gettingbigger
Observable
Universe
Whole Universe
Yes.
Yes.
Post-viewing
1. What is the Earth compared to Is the comparison useful in understanding the infiniteness of the universe
The size of the Earth within the observable universe is roughly equivalent to the size of a virus within the solar system. That does not help much, because we cannot really appreciate the incomprehensible smallness of a virus nor the bewildering bigness of our solar system either.
Activity 1: Discussion
2. What methods does the presenter use to enable viewers to understand this piece of know edge in physics
The presenter provides comparisons that are relative to our knowledge.
You and other three students are asking a professor who is giving a lecture some questions about universe. The following sentence structure will help you.
How old is the universe
How big is the universe
Is it becoming bigger or small
Is the Earth the center of the universe
Where is the edge of the universe
Activity 2: Speaking
Homework
Find more information online about the universe and share with the class.
本课结束