Lesson 25 Let’s Do an Experiment!教案设计（一等奖）

Unit 5 Look into Science Lesson 25 Let’s Do an Experiment! 主备人：国霞

时间: Teaching aims（教学目标）

1. 词汇

(1)掌握单词及短语：correct, method, force, turn…upside down, pour…out, scientific method, n take…off

(2)认知词语：experiment, jar, upside, pour, scientific, raincoat, pressure, conclude

2. Enable to describe the experiment in English 3. Know something about scientific experiments

Teaching important points(教学重点) Grasp mastery words and patterns

Teaching difficult points(教学难点)

Enable to describe the experiment in English

Teaching Preparation: pictures Teaching Aids: audiotape, flashcards, pictures Type of lesson: new lesson

Teaching steps(教学过程设计) Step 1. Learning new words and phrases of the text. Use pictures as many as possible. Try to let students grasp them in class. experiment n. 实验

do an experiment

jar n. 罐子

upside n. 上部

inside ;

outside

pour v. 倾倒

pour out ;

pour into

scientific adj. 科学的

science ;

scientist

;scientific

method

raincoat n. 雨衣

put on a raincoat

pressure n. 压力

the pressure of the air

conclude v.得出结论

n. conclusion

correct adj.正确的

v. 改正

adv. correctly

method n. 方法

force n. 力量

force …to do sth.

Step 2.Come to “THINK ABOUT IT”.

Let the students talk about the questions in groups. Then encourage them to talk about in class. What kinds of experiments have you done in science class? If you hold a jar that is filled with water upside down, what will happen?

Step 3. Discuss how to do the experiment ? Read the text and find the steps to do the experiment ! First , fill the jar with water . Next , cover the top with a piece of cardboard and hold it there . Then , turn the jar upside down and take your hand off the cardboard . Finally , see what will happen ? Conclusion ：The air pressure helps the cardboard hold the water in the jar . Step 4. Reading tasks.

Read and finish Exercise 1 on Page 67. Encourage students to finish it independently. Then check answers as a class. After finishing it, ask students to try to retell it. Step 5. Explain the language notes to the students. 1. Then I turn the jar upside down and take my hand off the cardboard. 然后我把广口瓶倒过来把手从硬纸板上拿开。

1) turn sth. upside down意为“把某物倒过来”，相当于短语turn sth. over。

Don’t turn that glass upside down.别把那个玻璃杯倒过来。

2) take…off此处意为“从……拿开”，take off意为“脱下，起飞”等。

Take your hand off that cake. 把你的手从蛋糕那拿开。

Take off your wet boots. 脱下你的湿靴子。

2. I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet. 我对我的理论如此有把握以至于布莱恩可以在你的头顶上做这个实验，并且我知道你不会变湿。

be sure of sth.意为“确信，一定”，后跟名词或代语。其后还可跟不定式或从句。

Be sure to go to bed early. 一定要早睡。

I am not sure whether he will come. 我不确定他是否会来。

Step6.Come to “LET’S DO IT”.

Do Exercises 2 on Page 67. Let students work it out in pairs. Then check answers as a class. Homework(作业)

1. Remember words and patterns of the lesson. 2. Do the experiment after class.