人教英语选修9Unit2Reading .ppt
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1、UNIT2 Sailing the oceansQuestion:How many oceans are there in the world?Pacific OceanAtlantic OceanIndian OceanArctic Oceanthe Arctic Oceanthe Indian Oceanthe Pacific Oceanthe Atlantic OceancompassAstrolabe(星盘星盘)Sextant(六分仪六分仪)sea/nautical chartearly navigational instrumentsRead about what navigatio
2、n was like before modern instruments were used.Sailing the oceansFast-reading How did seamen explore the oceans before latitude and longitude made it possible to plot a ships position?Page 1Using nature l Keeping alongside the coastlinel Using celestial bodiesl Using wildlifel Using the weatherl Usi
3、ng the seaUsing celestial bodiesto plot the positionsto work out the latitudea special cloud formation indicates there is land close byUsing wildlifeIf seaweed was fresh and smelled strongly,the ship was close to land.Sea birds could be used to show the way to land when it was nowhere to be seen.Usi
4、ng the weatherTo help identify the position of a stream or river whenTo direct their sailing Use the information to analyze the navigational skills and write the answers in your own words.1.To find the ships position at sea a sailor used _.2.A sailor knew that land was nearby if he saw_ _.3.Sailors
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