Lesson 25课件2023-2024学年冀教版九年级英语全册

Lesson 25 Let’s Do an Experiment！ Let's do an experiment. jar n. 广口瓶；罐子 paper water n. 实验；试验 Do you think what the theory is? upside pour Do the experiment in this way. ①Fill the glass jar with water. ②Put a piece of cardboard over the jar. ③Turn the glass jar over quickly. ④Hold your hand on the cardboard for a few seconds ⑤Remove your hand from underneath the jar. What happens? ☞The jar of water is upside down, but the water stays in the jar. What is the theory? ☞There is more air outside the jar than inside, so there is more air pressure outside than inside. method raincoat force pressure conclude correct scientific n. 方法；办法 n. 雨衣 n. 力量 v. 迫使；强迫 n. 压力；压强；挤压 v. 得出结论；推断出 adj. 正确的；恰当的 adj. 科学的 New words Discuss Do you like to do experiments? What experiments have you done? Listen to the tape and answer the following questions. 1.What’s Danny’s theory? 2.What’s Jenny’s theory? Danny thinks the floor will get wet. Jenny thinks the water will stay in the jar. Read the lesson and answer the questions. 1.Where does Danny think they should do the experiment? 2.What keeps the water in the jar? 3. Is Jenny sure of her theory? How do you know? He thinks they should do it outside. The force of the air. Yes, she is. She thinks that Brian can do the experiment over Danny’s head. 4. Why does Danny put on his raincoat? 5. What does Danny conclude? He thinks the water will pour out. The air is stronger than he thought. I fill a jar_______water. ▶cover…with… 用……盖住…… 2. I turn the jar _______ down. upside down “向下翻转过来” ▶right side up “正面朝上” Practice with fill ... with... 用....装满..... upside 3. I observed her _______. 4. When I passed by the grass, I observed him _________. ▶ observe sb. do/ doing sth. dance walking Fill in the blank with the proper word. The first letter is given. 1. Let’s do the e and see what happens. 2. A “t ” is an idea and predi