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人教2003课标版《Warming up、Pre-reading、Reading、Comprehending》精品PPT课件优质课下载
A navigator explores ________.
An explorer discovers new places _________.
the sea
on land
Question: How many oceans are there in the world ?
Pacific Ocean
Atlantic Ocean
Indian Ocean
Arctic Ocean
Is he a navigator or an explorer?
How do you think Zheng He found his way before modern accurate methods of navigation were invented ?
He made seven voyages during his lifetime and contributed greatly to the science of navigation in China.
compass
Astrolabe(星盘)
Sextant(六分仪)
sea/nautical chart
navigators
early navigational instruments
Reading
what's the main idea of the passage?
The main idea is how seamen explored the oceans and what kind of navigational instruments were used to sailors before the seventeeth century.
Fast Reading
Reading for structure
Using nature to help
There are two navigational methods mentioned in the passage. What are they?