高中英语 Unit 2 Sailing the oceans单元学案 新人教版选修9Word格式文档下载.docx

高中英语 Unit 2 Sailing the oceans单元学案 新人教版选修9Word格式文档下载.docx

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（SAILINGTHEOCEANS）

Aims

Tohelpstudentsreadaboutsailingtheoceans

Tohelpstudentslearnaboutthepredicate

Procedures

■Warmingupbyleaningaboutnavigator

Whatisanavigator?

Anavigatoristhepersononboardashipresponsibleforthenavigationofthevessel.Onaircraft,thepositionmayalsobereferredtoasaflightofficer.Thenavigator'

sresponsibilitiesincludeplanningthejourney,advisingthecaptain（orpilot）whileenroute,andensuringthathazardsorobstaclesareavoided.

Whatisexploration?

Explorationistheactofsearchingortravelingforthepurposeofdiscovery,e.g.ofunknownregions,includingspace（spaceexploration）,oroil,gas,coal,ores,water（alsoknownasprospecting）,orinformation.

Explorationhasexistedaslongashumanbeings,butitspeakisseenasbeingduringtheAgeofExplorationwhenEuropeannavigatorstravelledaroundtheworld.

Inscientificresearch,explorationisoneofthreepurposesofresearch（theothertwobeingdescriptionandexplanation）.Explorationistheattempttodevelopaninitial,roughunderstandingofsomephenomenon.

■WarmingupbytalkingaboutZhengHe'

sSevenVoyages

InJuly11,1405,theeunuchZhengHeoftheMingDynastyroyalcourtsetoutonhisfirstoverseasvoyage.

Inthefollowing28years,thisnavigatorproceededtocarryoutsixmorevoyages,accompaniedbyahugeentourageofnearly30,000people.BytravelingthroughoutSoutheastAsia,andaroundtheIndianOceanto

theRedSeaandEastAfrica,healsolandedatoverthirtydifferentnations.

Hewastheearliestlargestscalenavigationinworldhistory,comingmorethanhalfacenturyearlierthanColumbus'

famousexploits...

■Warmingupbylookingandlistening

Hello,class.Doyouknowthisman?

Yes,heisMarcoPolo.

themostfamousWesternertraveledontheSilkRoad.Heexcelledalltheothertravelersinhisdetermination,hiswriting,andhisinfluence.HisjourneythroughAsialasted24years.Hereachedfurtherthananyofhispredecessors,beyondMongoliatoChina.Hetellthetale,whichbecamethegreatesttravelogue.

I.Pre-reading

Whatarenavigationalinstruments?

●Navigationalinstrumentswerebuiltintheageofexplorationtoguidetheexplorerstotheirdestinations.

●navigationalinstrument-aninstrumentusedfornavigating

◇artificialhorizon,flightindicator,gyrohorizon-anavigationalinstrumentbasedonagyroscope;

providesanartificialhorizonforthepilot

◇compass-navigationalinstrumentforfindingdirections

◇depthfinder-navigationalinstrumentusedtomeasurethedepthofabodyofwater（asbyultrasoundorradar）

◇inclinometer-aninstrumentshowingtheanglethatanaircraftmakeswiththehorizon

◇instrument-adevicethatrequiresskillforproperuse

◇asdic,echosounder,sonar-ameasuringinstrumentthatsendsoutanacousticpulseinwaterandmeasuresdistancesintermsofthetimefortheechoofthepulsetoreturn;

sonarisanacronymforsoundnavigationranging;

asdicisanacronymforanti-submarinedetectioninvestigationcommittee

II.Readingforforms

ReadthetextSAILINGTHEOCEANSonpage12to:

cut/thesentenceintothoughtgroups,blackenthepredicative,darkentheconnectivesandunderlinealltheusefulexpressions.

SAILINGTHEOCEANS

Wemaywellwonder/howseamenexploredtheoceans/beforelatitude/andlongitudemadeitpossible/toplotaship'

sposition/onamap．Thevoyagesoftravelers/beforethe17thcentury/showthat/theywerenotatthemercyofthesea/eventhoughtheydidnothavemodernnavigationalaids．So/howdidtheynavigatesowell?

Readthesepages/fromanencyclopedia．

Pagel：

Usingnaturetohelp

Keepingalongsidethecoastline

Thisseemstohavebeenthefirst/andmostusefulformofexploration/whichcarriedtheminimumamountofrisk．

Usingcelestialbodies

NorthStar

AttheNorthPole/theNorthStarisatitshighestposition/inthesky,butattheequator/itisalongthehorizon．So/accomplishednavigatorswereabletouseit/toplottheirpositions．

Sun

Onaclearday/especiallyduringthesummer/thesailorscouldusethesun/overhead/atmiddaytonavigateby．Theycanusetheheightofthesun/toworkouttheirlatitude．

Clouds

Seacaptainsobservedtheclouds/overislands.Thereisaspecialcloudformation/whichindicates/thereisland/closeby.

Usingwildlife

Seaweed

Sailorsoftensawseaweed/inthesea/andcouldtell/bythecolour/andsmell/howlongithadbeenthere．Ifitwasflesh/andsmelledstrongly，then/theshipwasclosetoland．

Birds

Seabirdscouldbeusedtoshowtheway/toland/whenitwasnowheretobeseen．Intheevening/nestingbirdsreturntoland/andtheirnests．So/seamencouldfollowthebir