初中冀教版Lesson 25 Let’s Do an Experiment!课前预习ppt课件

这是一份初中冀教版Lesson 25 Let’s Do an Experiment!课前预习ppt课件，共12页。PPT课件主要包含了Homework等内容，欢迎下载使用。

a piece f cardbard
a bttle f water
D an experiment with the scientific methd.
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 f 装 满…...
2. Cver the tp with a piece f cardbard and hld it.
（用…...覆盖…...）
The tp ___ ________ ____ a piece f cardbard ___ me.
I cver the tp with a piece f cardbard.(同意转换)
was cvered with by
be cvered with 被…...覆盖
3. Turn the jar upside dwn and take my hand ff the cardbard.
（把…...从…...拿开）
(1) turn ... upside dwn = turn ... ver
(2) take…ff… 把…...从…...拿开
He ______ the cver _____ the teapt.
tk ff
The water desn't pur ut.The frce f the air keeps the water in the jar. It is strng enugh t hld the water.Air is strnger than I thught.
Let’s d the Experiment!
3. Turn the jar upside dwn and take my hand ff the cardbard.
2. Cver the tp with a piece f cardbard and hld it.
Listen and answer the questins :
1. Why des Danny put n his raincat?
2. What keeps the water in the jar?
3. What des Danny cnclude?
Because he thinks he will get wet.
The frce f the air. / The air pressure.
Air is strnger than he thught.
( ) 1. Culd yu help me fill the basket ______ apples? A. n B. in C. f D. with( ) 2. I am ______ the weather will be fine tmrrw. A. think B. sure C. hpe D. see( ) 3. “All ver the wrld ” is _____ way f _____ “arund the wrld”. A. ther ; saying B. anther ; say C. anther ; saying D. the ther ; saying( ) 4. He wrks _____ than I think. A. hard B. harder C. hardest D. hardly( ) 5. This pair f jeans is different ______ that ne. A. t B. with C. n D. frm( ) 6. Dn’t laugh _____ yur classmates when they _____ mistakes. A. at ; make B. at ; made C. t ; make D. with ; have( ) 7. – What’s the truble, dctr? -- Dn’t wrry. There is _____ with yu. Yu’ll be better sn. A. smething much wrng B. anything much wrng C. much wrng nthing D. nthing much wrng
What happens when yu use less water, mre water, wet cardbard, r different kinds and sizes f jars?