Reading and vocabulary名师教学设计1

Cloning and DNA 【Learning goals】

1. To grasp the general idea of the text. 2. To master some reading skills. 【Learning difficult point】

Understanding the general idea of the text. 【Learning key points】

1. The advantages and disadvantages of cloning and DNA 2. Real-time production----writing. 【Learning procedure】

Step 1. Lead-in

Step 2. Exploration

Title Cloning and DNA

Advantages Disadvantages 1. An optional treatment for couples 1. The clone would be under who find it _______to have children.

unknown ____________pressure. The possible 2. To _________ the talents of reasons for exceptional human beings cloning 3. To obtain a supply of _____ cells 4. It would be ______ to clone. It has helped solve ________.

Step 3. Exercise Summary

There are many valid reasons for cloning.

The first reason is cloning can be an_________treatment for couples who find it _______ to have children. Another reason is to produce the talents of __________ human beings. A further reason is to obtain a _______ of stem cells. A fourth reason for cloning is that some scientists and farmers think it would be______to clone a prize cow which can _____ bacteria or disease, or to sow a ______ crop. Finally, the _____ research into DNA has helped solve crimes.

However, there is no garden without weeds. Cloning is no exception, which means it also has its own disadvantages.

Firstly, anyone _____ was a clone of one of their parents would be under unknown ___________ pressure. Secondly, the cloned exceptional human beings might choose a contradictory life path to the ___________ one and even possess new vices.

Thirdly, the _______ where stem cells come from would be wasted, which many people find ___________. At last,

to rely on a few cloned animals or crops would restrict the ___________of the breed.

1 2. He might choose a contradictory life path to the ________ one and may even possess new vices.

3. The _______ would be wasted. 4. It would ________the biodiversity of the breed.

Step 4. Discussion

1. Discuss in groups to write out more advantages and disadvantages about cloing, and the given words may be helpful. Advantages: cure serious disease

benefit the economy

prolong human life span

save extinct animals

……

Disadvavtages: success rate

survival rate

moral(道德的)

natural laws

leave the world a mess

……

2. Debating----To clone or not to clone?

Step 5.

作业：请同学们完成下面作文，可以适当发挥，字数不限。

To clone or not to clone Today in our English class, we’ve had a discussion about whether __________________________. In fact, there are both advantages and disadvantages in _______________________.

Generally speaking, it is widely believed there are several positive aspects as follows. To begin with, _____________________________________. In addition, ____________________________________. (…)

However, as a popular saying goes, every coin has two sides. _______________ is no exception, and in other words, it still has negative aspects. Firstly, ____________________________________________. And secondly ____________________________________________.(…)

To sum up, through the above analysis, I believe that ______________________________________.

______________________________________________________________.

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