(
课件网) Unit 5 Look into Science Lesson 26 学习目标 1 2 3 掌握单词： match 接触单词：holder, shallow, lighter, examine, oxygen 短语：use up, be made up of 相信科学，热爱科学，运用科学，服务人类。 掌握本课所学的单词和英语表达；能用英语描述实验步骤及所看到的实验现象。 新课讲授 Free talk Do you like doing science experiments Why or why not What experiment have they done before What will happen if you put a jar upside down over a burning candle Yes, because experiments can enable us to explore the mysteries of nature. Air Pressure test. candle a candle holder 烛台 / h ld / n. 支托物；持有者 New words a shallow plate / l / adj. 浅的 lighter matches holder n. 支托物；持有者 shallow adj. 浅的 lighter n. 打火机；点火器 match n. 火柴 examine/ ɡ z m n / v. 检查 oxygen / ks d n/ n. 氧气 Read and put the sentence in the right order. Light the candle. Examine the water in the jar. What can you see Carefully put the jar over the candle until the top of the jar rests on the dish . Put the candle in the candle holder. Fill the dish half full with water. Let the candle burn for two or three minutes. Put the candle holder on the dish. 4 7 6 1 3 5 2 Fast reading 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 4. What is happening Half full of the dish. Two or three minutes. Put it over the candle until the top of the jar rests on the dish. The water inside the jar rises. Careful reading Read and think about. 1. How far does the water rise 2. Why does the water rise One fifth of the jar. 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. 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 1. a lighter or matches 打火机或火柴 match ① n. 火柴，复数形式为matches。 a box of matches 一盒火柴 ② n. 比赛，复数形式matches。 three basketball matches 三场篮球赛 ③ v. 相称；相配 Your tie matches your suit. 你的领带和你的套装相配。 Language points 2. Examine the water in the jar. 检查广口瓶里的水。 examine v. ① 检查。 后接名词或代词作宾语。 The doctor examined the patient. 那位医生检查了那位病人。 ② 考核，测验 Our teacher will examine us on history.我 ... ...
