(
课件网) Lesson 26: Keep the Candle Burning Unit 5 Look into Science 单词: holder, shallow, lighter, match, examine, oxygen 短语: use up, be made up of 句子: （1）As the candle burns, it uses the oxygen in the air. （2）When the candle stops burning, it has used up all the oxygen in the air. （3）Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. Learning Goals 1 能用英语流利地描述做实验需配备的器物，并讲述实验的步骤。 2 Free Talk Do you like doing science experiments Why or why not What will happen if you put a jar upside down over a burning candle Presentation 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 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! 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 Vocabulary holder n. 支托物；持有者 shallow adj. 浅的 lighter n. 打火机；点火器 match n. 火柴 v. 相称；相配 examine v. 检查 oxygen n. 氧气 use up 用光；用完 be made up of 由……组成 Structures and Expressions Let’s do it! 1. Read the lesson 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. match Let uses burning rises one fifth 2. Circle the correct words to complete the sentences. 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 ... ...
