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1. Fill the dish half full of water
2.To make a candle burn , you light it
教学
难点Write a composition to describe an interesting experiment.教法Talk ,listen , read, practice学法Talk ,listen , read, practice教具tape slides
板
书
设
计
Lesson 26
分数的英语表达
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
教 学 教 程教 师 活 动学生活动Step 1.Greetings.
设计意图：让学生做好上课的准备。
Step 2. Think 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?
设计意图：与学生进行一个简短的对话，进入本课主题。
Step 3. Show students the pictures to let them know the process of this experiment.
设计意图：通过展示图片让学生理解整个实验过程。
Step 4. Read and fill in the blanks
Read the text and fill in the blanks:
Let’s do the experiment together! Put the candle in the candle holder. Put the candle holder on the dish. Fill the dish half full with water. Light the candle with a ___________ or a lighter. What can you see? The candle is burning. ____________ the candle burn for two or three minutes. Then carefully put the jar over it until the top of the jar rests on the dish. As the candle burns, it ___________ the oxygen in the air. When the candle stops ____________, it has used up all the oxygen in the air. The water inside the jar __________ and fills about ___________ of the jar. This is because about one fifth of the air is made up of oxygen.
设计意图：让学生带着任务读课文。
Step 5. Language Points
1. 分数的表达
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。