Unit 5 Lesson 26 课件 2023-2024学年冀教版英语九年级全册

Unit 5 Lesson 26 We will learn The new words: holder, shallow, lighter, match, examine, oxygen Important and difficult points: ①Let the candle burn for two or three minutes. ②When the candle stops burning, it has used up all the oxygen in the air. ③How far does it rise? ④Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. Do you like doing science experiments? Why or why not? Lead in Think about it What will happen if you put a jar upside down over a burning candle? a candle What do we need to do the experiment? a candle holder lighter light (lit, lighted / lit, lighted) 点燃,使燃烧 burn (burned, burnt/ burned, burnt) 燃烧 a match matches a big glass jar a shallow dish with water Read and answer the questions. 1. How much water should we fill the dish? 2. How long should we let the candle burn? 3. Where should we put the jar? Half full of the dish. Two or three minutes. Put it over the candle until the top of the jar rests on the dish. Listen Part : Listen and answer the question. What is happening? The water inside the jar rises. Read and answer the questions. 1. Why does the water rise? 2. How far does the water rise? When the candle stops burning, it has used up all the oxygen in the jar. So the air pressure outside the jar is stronger than that in the jar, and the force of the air outside makes the water inside rise. One fifth of the jar. Part : Language points 1.Science is so interesting! so为副词,“这样,如此”,用于修饰形容词或副词的原级,表示程度。常见用法如下: (1)“so+形容词+a/an+单数名词” “such a/an+形容词+单数名词”。 (2)so后可接many,much,few和little来表示名词的数量。 (3)so…that…“如此…以至于……” 2. Language points. T: OK, let’s find the phrases and sentences that you can’t understand. Let’s learn them together. 14 2.Light the candle. light(lighted/lit,lighted/lit) v.“点燃” light up“点(烟),照亮”(代词放中间) (1)light n.“灯,光”。 (2)light adj.“轻的,浅的”。 2. Language points. T: OK, let’s find the phrases and sentences that you can’t understand. Let’s learn them together. 15 3.Carefully put the