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人教2003课标版《Warming up、Pre-reading、Reading、Comprehending》新课标PPT课件优质课下载
intervention(介入) .
Warming up
Two kinds of clones:
Natural clone
Man-made clone
A strawberry plant
The new plants that grow from the runners are exact copies of the original plant.
Twins
They are born naturally and identical in sex and appearance.
Growing new plants
A stem
Take cuttings from growing plants to make new ones.
富贵竹插枝即活
The gardener cuts the plant ,and then the cutting produces another new plant.
Quiz:
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).
Are the following clones the same?
If not, what is the difference?
NO. The first two are man-made clones,
the rest two are natural clones.
2001 cloning cattle
2002 cloning cats
2005 cloning dogs
Reading
1.Find the main idea of every paragraph