冀教版九年级上 Unit 5 Look into Science Lesson 25 Let's Do an Experiment(1) 课件(共12张PPT)

(共12张PPT)
Lesson 25
Let’s Do an Experiment!
冀 教 版 九 年 级
(n.)
jar [d ɑ ]
a piece of cardboard
广口瓶、罐子
a bottle of water
Do an experiment with the scientific method.
1. Fill the jar with water.
(用…...把…...装满）
I fill the jar with water.
(同意转换)
The jar ____ ______
_____water by me.
was filled
with
be filled with = be full of
装 满…...
2. Cover the top with a piece of cardboard
and hold it.
（用…...覆盖…...）
The top ___ ________ ____
a piece of cardboard ___ me.
I cover the top with
a piece of cardboard.(同意转换)
was covered with
by
be covered with 被…...覆盖
3. Turn the jar upside down
and take my hand off the cardboard.
（把…...翻转）
（把…...从…...拿开）
(1) turn ... upside down
= turn ... over
(2) take…off… 把…...从…...拿开
He ______ the cover _____ the teapot.
（n. 盖子）
（n. 茶壶）
took off
The water doesn't pour out.
The force of the air keeps the water in the jar.
It is strong enough to hold the water.
Air is stronger than I thought.
Let’s do the Experiment!
1. Fill the jar with water.
3. Turn the jar upside down and take my hand off the cardboard.
2. Cover the top with a piece of cardboard and hold it.
The water doesn't pour out.
The force of the air keeps the water in the jar.
It is strong enough to hold the water.
Air is stronger than I thought.
Listen and answer the questions :
1. Why does Danny put on his raincoat
2. What keeps the water in the jar
3. What does Danny conclude
Because he thinks he will get wet.
The force of the air. / The air pressure.
Air is stronger than he thought.
Exercises
( ) 1. Could you help me fill the basket ______ apples
A. on B. in C. of D. with
( ) 2. I am ______ the weather will be fine tomorrow.
A. think B. sure C. hope D. see
( ) 3. “All over the world ” is _____ way of _____ “around the world”.
A. other ; saying B. another ; say C. another ; saying D. the other ; saying
( ) 4. He works _____ than I think.
A. hard B. harder C. hardest D. hardly
( ) 5. This pair of jeans is different ______ that one.
A. to B. with C. on D. from
( ) 6. Don’t laugh _____ your classmates when they _____ mistakes.
A. at ; make B. at ; made C. to ; make D. with ; have
( ) 7. – What’s the trouble, doctor
-- Don’t worry. There is _____ with you. You’ll be better soon.
A. something much wrong B. anything much wrong
C. much wrong nothing D. nothing much wrong
D
B
C
B
D
A
D
Homework
What happens when you use less water,
more water, wet cardboard, or different
kinds and sizes of jars
Thank you