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book8 unit2 Reading


Reading

1996

cloning sheeps

2001 cloning cattle

我国成功繁殖克隆兔
体形要比普通兔大许多

2002年5月中旬 成功地繁殖了一 只胚胎细胞克隆

兔。

2002 cloning cats

第一只克隆宠物猫

克隆马及其“母亲兼姐
姐”

2002年4月十六日美 国第一头克隆牛“艾 米”产下牛犊喜作妈 咪

2005 cloning dogs

克隆的荧光小猪(左)和正常小猪(右)

Discussion In pairs, look at the following pictures and

discuss which ones are natural clones and which ones are man-made. Explain how
they differ.

Natural clone is one that occurs in a natural form of cloning without human help. Man-made clone is one that produced through human intervention(介入) .

A strawberry plant

A strawberry plant

The new plants that grow from the runners are exact copies of the original plant.

一株草莓依靠它沿地“爬走”的匍匐茎,一年内就能长出 数百株草莓苗

富贵竹插枝即活

The gardener should cut the plant ,then the cutting produce another new plant.

Twins

They are born naturally and identical in sex and appearance.

Dolly the sheep

How does Dolly differ from other sheep? She was cloned while the others were born naturally.Dolly was a ______ cloned sheep.

Reading

1. Skim and sum up the main idea of
each paragraph.

the main idea of each paragraph.
1. The definition _________ of cloning
2.Cloning has ____________ two major uses. 3.The _________ problems of Dolly. effect of Dolly. 4. The ________

5. It is __________ forbidden to clone human beings.

Try to get the answers to the following five questions.

1. What is cloning?

2. What are the two major uses of cloning? 3. Try to descirbe the procedure of cloning in Chinese. 4. Why is cloning controversial according to the passage? 5. What is the author’s attitude towards cloning ?

1. What is cloning? It is a way of making an exact copy of another animal or plant.
1996

2. What are the two major uses of cloing? Firstly,…commercial; Secondly, …research…

4. Why is cloning controversial according to the passage?
On one hand, it may be used cure serious disease and even t produce human beings. On the hand, some evil leaders may use it to clone themselves to attain their ambitions. Moral questions may also be raised.

The word “controversial” in para 4 probably means ____________. A. complicated B. arguable C. important

5. The writer’s attitude towards cloning
A. Objective(be fair) B. Negative (be against it) C. Positive (be in favor of it) the author does not state any Because_______________________________________

personal opinion about cloning.
______________________

supplement

The problems of Dolly At first, the fact that Dolly developed _________ normally in a natural way was encouraging ___________. Later, the news _____she lived for six years, that half the length of the life of the orginal ______ one was __________. disturbing Finally, the problem that occurred to the scientists was that a cloned animal lives __________ shorter than the original one.

Discussion

1. Which is easier to clone, plant or animal?
Because cloning plants is straightforward , but the cloning of animals is very complicated.

2. What’s your attitude towards forbiding research into human cloning.

Homework

1. Translate the procedure of cloning Dolly the sheep into Chinese. 2. Read the passage again after class.


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