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*教学过程设计
教学过程
一、创设情境，切入主题
Step 1：Warming up
What’s this？(It’s a candle.)We will have an interesting class.Can you guess what we will do in this class？There are some things that may be used in an experiment.Do you want to know what will happen？Today we’ll learn Lesson 26：Keep the Candle Burning.
设计意图：利用带来的教具，凭着学生对科学强烈的求知欲和好奇心，学习本课的新词，并鼓励他们表述实验。
二、展开过程，探究新知
Step 2：Presentation
1.Watch，Say and Fill
(1)What do we need?
We need a candle，a candle holder，a big glass jar，a shallow dish，some water and a lighter.
(2)What do we do?
First，________ the candle ___ _____ the candle holder.
Then ________ the candle holder ________ the dish.
Third ________ the dish ________ water.
Fourth，________ the candle.
Fifth，________ the candle ________ for two minutes.
2.Imagine and Predict
If I put the jar over the candle until the top of the jar rests on the dish，what will happen?
I’m not sure./I’m sure it will...
I think... Maybe...
3.Then do Exercises 1 and 2 on Page 69
设计意图：教师描述实验过程，让学生熟悉实验流程，并让学生在听的过程中填出关键词，为下一步打好基础，并讨论会发生什么。体现本单元主题Talking About Science。
Step 3：Listen，read and think
1.Why did the candle stop burning?
Because it has ________ the oxygen in the air.(used up)
2.Why did the water rise?
Because the force outside the jar is ________ than the force inside the jar.(stronger)
3.How far did the water rise?
Because there is about ________ oxygen in the jar，so the water rises and fi lls about ________ of th e jar.(one fifth，one fifth)