Using LanguageⅡ课件配套优秀公开课教案设计

高中英语人教版选修8unit2 Cloning----- warming up教学设计

Teaching aims:

1. ability goals: Enable students to describe cloning.

The advantages and disadvantages of cloning

Your opinion of cloning 2. learning ability goals: help students how to describe cloning Teaching important points:

How to describe cloning Teaching difficult points: help the students analyze the writing techniques of an argumentative Teaching methods: task-based method and debate method Teaching aids: a recorder, a projector and some slides. Teaching procedures:

Step1. leading in

Show four sentences about cloning and then let them which sentences are true, which false to test how much they know about cloning.

Sentence1: Clone can be from both natural clone and man-made clone.

Sentence2: The sheep, named Kitty was the first successful clone of a mammal..

Sentence3: Only strawberries and cactuses

(仙人掌)are natural clones.

Sentence4: Since Dolly, researchers have cloned a number of large and small animals

including cats, rabbits and horses. Step2: warming up 1. Ask the students to look at the pictures in the textbook and discuss which ones are natural clones and which ones are man-made clones .

Picture1: man-made clone examples Dolly, the first mammal to be cloned from adult DNA, was put down by lethal injection on Feb. 14, 2003. Prior to her death, Dolly had been suffering from lung cancer and crippling arthritis (严重的关节炎).

Question: How does Dolly differ from other sheep? She was cloned while the others were born naturally. In other words, Dolly was a cloned sheep.

Picture2: a strawberry plant

natural clone

Picture3: growing new plant

man-made clone

Picture4: twins

natural clone 2.

give the students several minutes to think about a question: Q: what is the difference between natural clone and man-made clone?

Natural clone: it is one that occurs in nature without human help.

Man-made clone: it is one that is produced through human intervention (介入).

3. let students discuss: what is cloning?

clone is an animal or plant produced naturally or artificially from the cells of another animal or plant and is exactly the same as it. Cloning is a way of making an exact copy of another animal or plant. The clone has the same DNA as the parent.

4. show some important events in cloning history

A: In 5000 B.C. Human beings began to choose the best seeds from some kinds of crops. That was the beginning of controlling life according to human’s will.

B: In 1952 tadpole(蝌蚪）

was cloned . It is the first animal to be cloned.

C: In 1963 , an Asian carp(鲤鱼）

was cloned . Ten years later, a Chinese scientist named Tong dizhou cloned a European carp.

D: In 1978: The first case of tube infant (试管婴儿) appeared.

E: In 1996: The famous sheep “Dolly” was cloned successfully.

F: In 2001: cloning cattle; in 2002 cloning cats;

in 2003 Cloning horse; in 2005 cloning dogs 5. enjoy a comic

Woman A: Mary, who is that person?

Woman B: He is my husband.

Woman A: But I heard he died last year.

Woman B: Yes. I had him cloned. 6. Debate:

Q1:

What problems may arise when humans are cloned?

1) People may want to clone themselves so they can live forever. 2) People may want to clone dead children. 3) People may want to clone their favorite pets.

Q2: Is cloning good or bad for us?

A: I think cloning is good for us. Because …

B:

I think cloning is bad for us. Because …

Step3: writing

According to the key points the students have got above, ask them to write a short paragraph about whether cloning is good for us or not

Some expressions or sentence structures that may be of use to students:

With the development of……, ……

is playing a more and more important role in our daily life. Firstly, …. Besides ……

in addition ………

However, ……. also bring some problems. ………..

To sum up, only if we……, can we……. Step4: presentation

Ask some students to share their composition