Transcript Top10 inventions in 20th century

1、掌握本课重点单词，短语和句式。
2、让学生阅读理解什么是克隆、多莉羊的诞生与死亡以及由
此引发的争论。
3、进一步训练学生阅读、找读、细读、归纳要点、对比等阅
读技巧，把握篇章中心内容，获取关键信息，并能分析、判断
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作者对克隆的态度和见解。
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Top10 inventions in 20th century:
NO. 10 Atomic bomb
NO. 9
Space shuttle
NO. 8
Television
NO. 7 Artificial satellite
NO. 6 Aspirin
NO. 5
Airliner
NO.4 Personal computer
NO.3
Mobilephone
NO. 2 Internet
NO. 1 Cloning
Cloning
The plant produces its own runners.
Take cuttings from
growing plants to
make new ones.
A stem
They are identical
in appearance, and
are produced from
the same original
egg.
The twins
Dolly the sheep
没爹没娘的多莉羊
It is the exact copy of another sheep and
the first cloned mammal.
Cloning is a way of making an exact copy of
another animal or plant.It can be divided into
natural clone and man-made clone. A natural
clone is one that occurs in nature and a man-
made clone is one that is procured through
human intervention(介入，干预).
Main idea of each para.(Scanning)
______
3 The birth and death of Dolly.
______Scientists
are confused about the
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future of clone.
1 What is the cloning.
______
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______Controversy
brought by Dolly .
2 Two major uses of cloning.
______
Choose the right answer according to the text.
1.The main idea of the text is____
A. animal cloning is very valuable and can
benefit the world.
B. animal cloning could be misused by bad
people so it must be forbidden.
C. animal cloning is well developed because
Dolly the sheep was born.
D. animal cloning raised arguments and
scientists are not sure about its future.
2. The cloning of Dolly the sheep
succeeded because____.
A. its easier to clone a sheep than other
animals
B. the scientists were determined and worked
hard with patience
C. the scientists were rewarded and got lots
of money
D. many other attempts to clone mammals
failed
推理判断
3. The sheep that donated the somatic cell
most probably lived ____ years.
A. 3
B. 6
C. 9
D. 12
4. We can infer from the last three
paragraphs that ___.
A. The normal development of Dolly had no
effect on the cloning of other species.
B. Dolly’s serious disease and final death
disturbed the whole world.
C. Dolly successfully cloned a new lamb
with the help of cloning scientists.
D. There were arguments about animals
about animal cloning and concerns about
the future of cloning.
5. As for the cloning procedure of Dolly the
sheep, all of the following are true EXCEPT
_______________.
A. the lamb is the clone of the donated cell
from sheep B
B. electricity is needed
C. female sheep B provides an egg cell
D. three female sheep are used
6. From the last paragraph we know
that ______.
A. cloning will come to an end because of
objections
B. cloned human beings will be produced
in the near future
C. many countries will use cloning in a
wise way
D. all the research into human cloning will
be forbidden
"True" or"False"
1. Cloning means making a copy of an
animal or a plant.
F
2. Gardeners can make a lot of money by cloning
plants. T
3. Cloning animals is as complicated as cloning
plants. F
4. Dolly the sheep was the first successful clone of a
mammal.
T
5. Natural clones happen in animals as well as in
plants.
T
The procedure works of Dolly the sheep
Female sheep A
provides an egg cell. Dolly the
sheep
is
The nucleus is
created.
removed from the
Female sheep egg cell.
The embryo is
B provides a The egg cell is
ready for a new
put into female
somatic cell
nucleus.
sheep C.
The nucleus is The nucleus The cell divides
taken out of the and the egg
and grows into an
somatic cell.
cell are joined embryo.
Try to find out the detailed
information and fill in the blanks.
Definition
an exact copy of
It is a way ofmaking
____________________
another animal and plant.
commercial
of
2 major uses 1)to produce _____________quantities
of cloning plants .
2)It is valuable for research on new
______________and
medical
plants
species
research onanimals
________.
Cloning
procedure
Cloning plants isstraightforward
______________ while
cloning of animals iscomplicated
___________
The first
Dolly the sheep a
The cloning of _______________,
successful breakthrough
_____________ in cloning tech.
animal clone
Encouraging news :
It seemed to develop normally
________ and produced
_______way.
a______in
lamb anatural
The
Disturbing news:
problems It lived for ____
6 years, half the length of the
originalsheep.
of Dolly life of the _______
________
the sheep Its appearance raised a storm of objections
and had a great impact on the media
_____ and
imagination
public___________.
The effect
of the
Dolly
sheep
It opened everybody’s eyes to the
possibility of using cloning to cure
serious illnesses
_______________and
even produce
_____________.
human beings
• Evil leaders hope to clone
___________.
themselves
Arguments
on cloning
moral
• Religious leaders raised ________
questions.
forbade
• Many governments _______
research into human cloning.
• Some countries continued to
accumulate
___________evidence
of the abundant
medical aid.
Challenge yourself
1. In the second paragraph, the word
“straightforward” means ____.
A. uncomplicated B. honest C. frank D. difficult
2. It suddenly opened everybody’s eyes to the
possibility of using cloning to cure serious illness
and even to produce human beings. (translation)
它突然打开了人们的眼界，看到了有可能利用克隆技
术来治疗重病，甚至还有可能克隆出人类。
Challenge yourself
3. In an unfortunate way , the mice and Dolly sheep
had no choice but to die young. No one imagined
that this would happen and so no one could prevent
it.(Find a sentence which has the similar meaning)
Sadly the same arbitrary fate affected
other species, such as cloned mice.
4.What is the writing style?
A. Expositive （说明性的）
C. Argumentative （议论性的）
B.Descriptive
D. Narrative
Discussion
The writer’s reaction towards cloning is____
A. Positive
B. Negative
C. neutral
Learning tips:
The passage is written in the expositive style.
That is to say the text is in the third person and in
factual and formal language. It gives different
points of view and does not try to persuade the
reader to make up his/her own mind.
conclusion
Clone is a way of making an exact_______
copy of
major
another animal or plant. Cloning have two ______
uses. Firstly, gardeners use it all the time to
produce _____________quantities.
Secondly, it is
commercial
species
valuable for research on new plant _________and
for medical research on animals. But through the
_________and
death of Dolly, cloning has a lot of
birth
problems. On the other hand, we know cloning is
controversial in some countries for ________and
moral
___________reasons.
religious
Homework
1. Read the passage again.
2. Discuss the advantages and
disadvantages of cloning.