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选修8《Warming up、Pre-reading、Reading、Comprehending》PPT课件优质课下载
Lightning
A discovery is merely making known something that already _____ in nature.
An invention is something that is ______ by a human being.
created
exists
Newton ____________
gravity
discovered
discover/ invent?
Stephenson ________
the train
invented
discover/invent?
Columbus
the New Continent
1493,3,15
discovered
____________
discover/invent?
radium
Madame Curie _________
discovered
discover/invent?
DNA
Francis Crick