人教高中英语必修3 Unit 4 Astronomy: the science of the stars A visit to the moon 课件（共17张PPT）

(共17张PPT)
UNIT 4
A visit to the moon
Do you want to go to the moon?
Who was the first person that stepped onto the moom?
The pull of the earth’s gravity will disappear when you are in space.
You will be weightless.
The gravity of the moon is very light.
You will weigh less than on the earth.
The gravity on the moon is 1/6 as strong as it is on earth. This means that someone who weighs 150 lbs(磅) on Earth would weigh only 25 lbs on the moon! You might think that this would make walking much easier, but it is actually quite difficult Later in the Apollo(阿波罗) (Moon landing) mission, astronauts discovered that it was easier to hop(跳) than it was to walk .
Space walk
the first man in space
Yuri Gagarin
The first man on the moon
Neil Armstrong?
Russia 1961
U.S.A.
1969
Fast reading:
True or False
The force of of gravity would change four times on their journey . ( )
2. When they were on the moon, they would not feel the gravity because there was no gravity on the moon. ( )
3. Since the gravity has changed, their walk didn’t need a lot of practice. ( )
F
F
F
Detailed reading:
Read Para 2 carefully and underline 3 sentences that show the changes of the gravity.
as he left
in space
on the moon
It became very light.
The gravity became very strong.
The gravity disappeared.
the way gravity changed
left the earth
in space
on the moon
The three ways in which gravity changed for Li Yanping and how his weight changed.
1. The pull of gravity became very strong she left the earth’s atmosphere. His weight is normal.
2. It disappeared when he was in space. He is weightless.
3. It was very light when he was on the moon. He weighs less than on earth.
Was their returning painful? What happened to the spaceship?
Yes. Fire broke out on the outside of the spaceship.
Q&A
Last month I visited the moon with my friend. Before we left, I was told the force of ______ would change three times on our journey. Then we took off. Gradually the weight _______. When I was in space, it __________. We _______ weightlessly in the cabin and I _____ ____. When I was on the moon, I was surprised to find out even walking needs lots of practice ____ _____ gravity changed. The returning of the earth was very __________. We were amazed to watch fire ____ ____ on the outside of the ship.
gravity
lessened
disappeared
floated
cheered up
now that
frightening
break out
Summary
倍数表达法
1). “A + be + 倍数 + as +形容词原级
+ as + B”.
2). “A + be + 倍数 +形容词比较级
+ than +B ”
3). “A + be + 倍数 + the +名词
(size, length, amount) + of + B”
If you visit the moon
what problems will you meet with?
To solve these problems, what things will you take?
Please take down some notes while discussing, after discussion, please report it.
Example: If I visited the moon, I might have ? problems: The first one is···· Because ···· To solve this problem, I would take ····with me. The second one is ···· ····
Discussion:
How to cool you
You might have 4 main problems:
How to breathe
problems
What to eat
What to wear
spacesuit
oxygen tanks
space food
things needed
on the moon
If you follow this advice, I think you will have a good time on the moon.
water
Homework
Write a passage explaining three problems you might meet on the moon and how you will solve it.