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《Warming up、Pre-reading、Reading、Comprehending》精品PPT课件优质课下载
Inventors and Inventions
What are the four great inventions of ancient China?
Compass
Papermaking technology
Printing
Gunpowder
Who can you think of when you see these pictures?
the light bulb
Thomas Alva Edison
(1847-1931)
the steam engine
Thomas Newcomen
(1663～1729 )
Isaac Newton
(1643-1727)
gravitation
Marie Curie，(1867-1934)
A radioactive?element: Radium
Invention VS Discovery
Already exists?
Known by us?
Created?
Natural?
An invention is something that was created by human beings not existing before.
A discovery is finding out something