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What do you need?
1.a candle2.a candleholder3.a big glass jar4.a shallow dish5.some water 6.matches
What do we do?
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.Presentation and Giving DirectionsStep 5.Practise the experiment in groups. Remember to tell you classmates what to be need ,what to do and what will happen?
Step 6. 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。
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)
4) ? = one (a)quarter 或 one-quarter
use up
be made up of
Step 6. ExerciseConsolidation and Summary用适当的介词填空。
1. Please pass me the bottle full ______ water.
2. He is so hungry that he has eaten ______ all the food on the plate.
3. I usually put the candle ______ the candle holder.
4. Mr. Gao came into the classroom ______ a book in his hand.
5. The rainy day will last ______ three days.
根据汉语提示，翻译下列句子。HomeworkStep 7. Homework
请根据课文内容,以 “An Interesting Experiment”为题写一篇小作文。教学反思通过ppt的教学，学生熟悉了这个实验需要物品和实验步骤，大部分学生掌握了分数的表示以及重要的词汇。学生知道空气中含有五分之一的氧气， 学生对这个实验也感兴趣，但应当让学生用英语叙述这个实验过程和结果。
第 PAGE ﹨* MERGEFORMAT 1 页 共 NUMPAGES ﹨* MERGEFORMAT 1 页