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Teaching Preparation: pictures
Teaching Aids: audiotape, flashcards, pictures
Type of lesson: new lesson
Teaching steps(教学过程设计)
Step 1. Free talk:
Let the students talk about the questions in groups. Then encourage them to talk about in class.
Do you like doing science experiments? Why or why not?
What will happen if you put a jar upside down over a burning candle?
Step 2. Learning new words and phrases of the text.
Use pictures as many as possible. Try to let students grasp them in class.
match n. 火柴 holder n. 支撑者 shallow adj. 浅的lighter n. 打火机
examine v. 检查 oxygen n. 氧气
Step 3. Listening tasks.
Listen to the tape the tape and tell it is true or false.
1. The experiment needs a candle and matches.
2. We nee d to put water in a bowl.
3. The experiment proves the air has one fifth of oxygen.
Step 4. Show the experiments
Encourage students to look carefully and think about “what is happening?” Then check answers as a class. After finishing it, ask students to try to retell it.and do the experiment by themselves.
Step 5. Explain the language notes to the students.
1. Light the candle. 点亮蜡烛。
light此处用作动词，意为“点亮”。还可作名词，意为“光；灯”。作形容词，意为“轻的，浅的，明亮的”。
I want a room with good light. 我要一个采光好的房间。（名词）
My sweater is light blue. 我的毛衣是浅蓝色的。（形容词）
H e sat down and lit a cigarette. 他坐下点了一只香烟。（动词）
2. Because about one fifth o f the air is made up of oxygen, the water rises and fills about one fifth of the jar. 因为大约五分之一的空气是由氧气组成的，水上升填充了大约广口瓶的五分之一。
1) one fifth意为“五分之一”。英语中表示分数时，分子用基数词，分母用序数词；分子与分母间的连字符可加可不加。若分子大于1，分母则加-s。
Two thirds of the apples are red. 三分之二的苹果是红色的。
2) be made up of意为“由……组成”，of后可接人也可接物，指某物或组织的结构成分。
The club is made up of twelve girls. 这个俱乐部是由12个女孩组成的。