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人教高中英语选修9 U2 Warming up、Pre-reading、prehending 课件.ppt

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人教高中英语选修9 U2 Warming up、Pre-reading、prehending 课件.pptUnit 2 Sailing the oceans
GPS(global positioning system)
Zheng He
1371-1433
He led a large fleet to explore Southeast Asia, India and the Middle East in the Ming Dynasty. Altogether he made 7 voyages in the 15th century.
Marco Polo
1254--1324
He is the most famous westerner to travel the Silk Road. While in prison, he told the story of his travels to a fellow prisoner who wrote his adventures down. When the book the travels of Marco Polo was published, it became a best-seller.
Sailing the oceans
Scan the whole text and make a mind-map.
Mind-map
Main idea
How seamen explored the oceans before 17C
nature
coastline
celestial bodies
North Star
Sun
wildlife
seaweed
birds
weather
sea
clouds
fog
winds
navigational instruments
longitude
latitude
the Bearing Circle
the Astrolabe
the Quadrant
the Sextant
knotted rope
compass&maths
Comprehend your geographical knowledge and discuss the methods you are familiar with and share with others. (Make a diagram if necessary)
Students’ work

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