Unit 5 Look into Science Lesson 26 Keep the Candle Burning课件

课件25张PPT。Keep the Candle BurningThink about it!
Do you think science is interesting?
Why or why not?
2. Name one or two famous Chinese
scientists. What do you know about
them?Today we are going to look into science
again and learn to do another experiment.
What experiment will we do?Keep the Candle Burning!1. What do we need?a candle a big glass jara candleholder a shallow dish with water matches a match2. How do we do the experiment?
3. What is happening?Read the text silently and finish Ex. 1Language points 1) 分数由分子及分母两部分构成。用英语表达时，分子用基数词，分母用序数词。
2) 若分子为1，则分母的序数词为单数形式，若分子大于1，则分母的序数词用复数形式。
? ＝ one (a) half 或 one second (one-second)
? = one (a)quarter 或 one-quarter分数的英语表达二分之一
三分之一
四分之一
四分之三
五分之二
十分之九口 诀:
分子基，分母序。分子﹥1 ，分母加s 。a/one half (one second)
one-third
one quarter
three-fourths three quarters
two-fifths
nine-tenthsCan an egg “swim”in the water?1. What do we need?Do an experiment：First, _________________________.put some salt into the glassThen, _______________.add some waternext, ______________________________.mix the salt and the water togetherFinally, ______________________.put the egg into the glassThe egg can’t touch
the bottom of the
glass and it swims
in the water.3. What is happening?4. Why?盐水的密度变大，鸡蛋的浮力大于重力。There are lots of matchs in the small box.
Can you let my uncle laughing?
You’re very ill, so you must stop to smoke.
Fill the dish half fill of water.
There is about one–five oxygen in the air.
There are about two–third students in
the classroom.
7. I used out my money. Can you lend me some?Correct the mistakes.matcheslaughsmokingfullone-fifthtwo-thirdsup用所给单词的正确形式填空。
You are very tired. You’d better stop
______ (have) a rest.
2. What do you use to make a candle
_____ (burn)?
3. You should put the jar over the candle
________ (careful).
4. What ____________ (observe) can you
make?to haveburncarefullyobservation(s)5. Please cut the apple into ______ (half).
6. He _________ (light) a candle and the room was bright.
7. ______ (two), ask the students to guess
what will happen.
8. He kept the candle _______ (burn) for
two hours.
9. It’s time ______ (play) basketball.
10. What about _____ (go) for a walk?halveslighted / litSecondburningto playgoingHomework请根据课文内容, 以 “An Interesting
Experiment”为题写一篇小作文。Thank you.