(
课件网) Unit 5 Look into Science Lesson 26 Curriculum words：holder, shallow, lighter, match, examine, oxygen Useful expressions： Let the candle burn for two or three minutes. When the candle stops burning, it has used up all the oxygen in the air. Functions：Master the new words： holder, shallow, lighter, match, examine, oxygen Grammar：as的用法 Sentences： Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. How far does it rise 学习目标 Do you like doing science experiments Why or why not Lead in THINK ABOUT IT Do you like doing science experiments Why or why not What will happen if you put a jar upside down over a burning candle 新课讲授 Text presentation What do you need ·a candle ·a candle holder ·a big glass jar ·a shallow dish ·some water ·a lighter or matches Science is so interesting! I'm sure you'll like this experiment! Can you see the candle holder in this picture The candle is pink. The candle holder is grey. The candle holder is “holding” the candle! What do you do 1．Put the candle in the candle holder. 2．Put the candle holder on the dish. 3．Fill the dish half full with 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. 7．Examine the water in the jar. What can you see What is happening As the candle burns，it uses the oxygen in the air. When the candle stops burning，it has used up all the oxygen in the air. The water inside the jar rises. How far does the water rise Because about one fifth of the air is made up of oxygen，the water rises and fills about one fifth of the jar. Can you do this experiment Read the lesson and fill in the blanks. 1 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. match Let 's Do It ! Let uses burning rises one fifth Circle the correct words to complete the sentences. 2 1. Don't (use up /push up) all of the ink. Leave some for me. 2. The medical team (is made of / is made up of) five experienced doctors. 3. Please fill the hole (with /in) sand and water. 4. They didn't realize their mistake (until /as) we told them. 5. My brother wasn't (strong enough/enough strong) to lift the box. Read about the experiment in this lesson. With a group of classmates，practice the experiment. Do your experiment in front of the class. Don't f ... ...
