Lesson26 Keep the candle burning

______ 3. You’re very ill, so you must stop to smoke.
5. There is about one ________ – five oxygen in the air. two - thirds
one - fifth
_________ 6. There are about two – third students in the classroom. ___ my money. Can you lend me some? up 7. I used out
2. There is about one-fifth oxygees and fills about one-fifth of the jar. one-fifth “五分之一
” fifths two”
three-fourths
“五分之二
“四分之三
”口
诀：
分子基，分母序。分子﹥1 ，分母加 s
母叙（序）子饥（基）
二分之一 四分之一 四分之三
a/one half (不说：one second)
a/one fourth （还可说：a/one quarter）
three - fourths
three quarters
三分之二 五分之三 四分之一 九分之四 十二分之一
Put the candle in the candleholder.
Put the candleholder in the dish.
Fill the dish half full of water.
Light the candle.
How do we do the experiment?
Homework:
1.Further experiment：（实验拓展） When two candles burn in the jar, what will happen? Do it with your partners after class.
2. 正式：练习册1、2题。
Scientific experiment is endless.
新词过关
a shallow dish a deep bowl
There is about 20% oxygen in the air. one-fifth
match n. 火柴;比赛 light v. 点燃;使燃烧 burn v. 燃烧 shallow adj. 浅的 candleholder n. 蜡台;烛台 oxygen n. 氧气 one-fifth 五分之一
新词过关
burn-burned /burnt- burned /burnt
It’s a burning candle. make the candle burn=light the candle
light-lighted/lit-lighted/lit
a match
matches a candleholder
1). Put the candle in the candleholder. 2). Put the candleholder in the dish. 3). Fill the dish half full of water. 4). Light the candle. 5). Let the candle burn for two or three minutes. 6). Carefully put the jar over the candle until the top of the jar rests on the dish.
Correct the mistakes:
_____ in the small box. matches 1. There are lots of matchs
2. Can you let my uncle _______ laughing? 4. Fill the dish half __ fill of water. laugh smoking full
two-thirds three-fifths one quarter four-ninths one-twelfth
Questions:(问题追击)
Why did the candle stop burning?
Because there was ___oxygen no in the jar
Why did the water rise?
The force inside the jar is ______ stronger than the force inside the jar .
How far did the water rise? Why?
one-fifth It rose about ____________of the jar . Because there is one-fifth oxygen in jar the_____.
7). Look at the water in the jar.
What will happen?
The candle stops burning. The water in the jar rises.
How do we do the experiment
put First. _____the candle ____the candleholder. in Then. _____the candleholder ____the dish. put in Third. _____the dish ___________water . Fill half full of Fourth. Light ______the candle . Fifth. ______the candle ______for two or three let burn minutes . put over Sixth. _____the jar ___________ the candle rests on the dish. until the top of the jar ________
_______________________.
Summary
Words: match ，light ，burn，shallow candleholder， oxygen，one-fifth Phrases: use up, make/let/have…do.. stop to do sth. stop doing sth. How to describe the experiment?
1. As the candle burns, it uses up oxygen in the air. use up “用尽(材料)，设法利用(剩余的材料或时间)” Jim used up his money to buy the computer. eat up “吃光” drink up “喝光” She was hungry and ate up the bread. He drank up all the water.
科学实验无止境。
Goodbye!
What do you need to do the experiment?
a candle
a candleholder
a big glass jar
a shallow dish with water
matches
How do we do the experiment?
1). Put the candle in the candleholder. 2). Put the candleholder in the dish. 3). Fill the dish half full of water. 4). Light the candle. 5). Let the candle burn for two or three minutes.
Pair work
What do you need? We need _______________. What do you do? First,_________________. Second,_______________. Then,_________________. ... What is happening?