Lesson 26 Keep the Candle Burning第一课时教学设计

Lesson 26：Keep the Candle Burning 时间：2018.12.13

节次：第3节

班级：九（3）

教师：薛晓鹏

教学目标：

1. Listen and understand the experiment. 2. Learn to do the experiment by yourself. 3. Learn some useful words and expressions.

教学重难点：

1.

Some words and expressions in this lesson.

Words: match

holder

shallow

lighter

examine

oxygen Phrases: use up

be made up of

2. Know the usage of the key words and expressions.

Teaching methods: Listening,Reading,Groupwork. Preparation before class: a candle,a candle holder,a big glass jar,a shallow dish,some water,a lighter or matches. 教学过程：

Ⅰ.目标导入

Think about the questions: 1.Do you like doing science experiments? Why or why not? 2.What will happen if you put a jar upside down over a burning candle? Ⅱ.预习检测

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 uses 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. Ⅲ.质疑互动

1.Listen to the tape and read the text together. 2.Do the experiment in groups. 3.Discuss and find out the key phrases. ①When the candle stops burning, it has used up all the oxygen in the air. 当蜡烛停止燃烧时，它已经耗光了空气中的氧气。

use up

用尽；耗光

例如：他已用完了所有的纸。

He has used up all the paper. ②Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. 因为空气的五分之一是由氧气组成的，所以水会上升到瓶子五分之一的位置。

be made up of “用……构成或组成的”，指结构成分，指人、物皆可。

例如：这个句子是由五个单词组成的。

This sentence is made up of five words.

Ⅳ.达标纠错

一、根据汉语提示完成句子。

1. She rubbed another ______ (火柴) on the wall.

2. The dish is too _______ (浅的) to serve soup in. 3. We should ________ (检查) ourselves and learn who we are.

4. Carbon dioxide consists of carbon and_______ (氧气).

二、圈出正确的单词或短语完成句子。

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. 三、翻译下列句子。

1. 别把所有的钱都用光。(use up) Don’t use up all the money.

2. 我们班是由35名学生组成的。(be made up of) Our class is made up of 35 students. Ⅴ.收获评价

What have you learnt from this lesson? Homework 1.The students in Group A finish Exercise 3 in the workbook. 2.The students in Group B finish Exercise 2 in the workbook. Bb design Lesson 26：Keep the Candle Burning 1.use up He has used up all the paper. 2.

be made up of This sentence is made up of five words.

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