人教版高中英语选修9 Unit 2 Australia Sailing the Oceans Warming up and Reading 课件 （共19张PPT)

课件19张PPT。Unit 2Sailing the oceansSee a film and answer the question: What is about the film?Lead-in: He made seven voyages during his lifetime and contributed greatly to the science of navigation in China. He travelled more than 50,000 km and visited 30 countries new to China and developed many trade links. He is considered one of the earliest naval explorers in Chinese history.We’re proud of these great navigators for their great contributions to the world. New words and expressionsvoyage :long journey by sea or in space mercy : kindness or forgiveness at the mercy of : under the control of sb. or sth. encyclopedia : book or set of books giving information about every branch of knowledge exploration : activity of exploring minimum : least or smallest celestial :heavenly; of the sky pole : point New words and expressionsequator : imaginary line around the earth half between its north and south poles horizon : line at which the earth and sky appear to meet knot : a part where one or more pieces of string, rope ,cloth etc. accelerate : speed up log : thick piece of wood magnetic : having the qualities of a magnet precise : exact or accurate Compass /' k?mp?s/Astrolabe(星盘) /'?str?le?b/Sextant(六分仪）/'sekstent/Sea/Nautical Chart（航海图）Early navigational instrumentsHow do you think seaman found their way before modern accurate methods of navigation were invented ?1.What is the type of writing of the passage? A. Narration(记叙文) B. exposition (说明文) C. argumentation (议论文) 2. How many instruments are used to find latitude? A. 3 B. 4 C. 2 D. 5 Fast-readingBB1.How did they use nature to help sail the oceans? 2.Why did they use instruments in the sailing? 3.Why are speed and time important in working out the longitude of the ship? 4.What are the working principles of the following instruments? Bearing circle / Sextant 5. What are the language features（特点）of the passage? 6. What can we learn from ancient navigators?Detailed reading1.How did they use nature to help sail the oceans?Keeping alongside the coastline Using celestial bodies Using wildlife Using the weather Using the sea Using 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.Using the weatherTo help identify the position of a stream or river when…To direct their sailingfogwind2.Why did they use instruments in the sailing?Because they could use them to find longitude and latitude.3.Why are speed and time important in working out the longitude of the ship? Because the earth moves fifteen degrees westwards every hour. If you know your direction, speed and time, you can work out the approximate longitude. 4.Try using your own words to describle the working principles of the following instruments? Bearing circle /Sextant5.What are the language features ... ...