高中英语选修九unit2sailingtheoceans课件warming-upreading资料新人教版.ppt

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1、SailingtheoceansSailingQuestion:Howmanyoceansarethereintheworld?PacificOceanAtlanticOceanIndianOceanArcticOceanworldmapexplorationWhatisanavigator?Whatisthedifferencebetweenanavigatorandanexplorer?Anavigatorexploresnewroutesacrossthesea.Anavigatorexploresthesea;ane

2、xplorerdiscoversnewplacesonland.ZhengHeIsheanavigatororanexplorer?HemadesevenvoyagesduringhislifetimeandcontributedgreatlytothescienceofnavigationinChina.compassAstrolabe(星盘)Sextant(六分仪)sea/nauticalchartnavigatorsearlynavigationalinstrumentsPre-readingThefourbasicin

3、strumentsfornavigation:Sinan,theancientChinesecompass.ItwasinventedbyZhangHengintheHandynasty.astrolabesextantquadrantnauticalchartreadingSailingtheoceansUsingnatureKeepingalongsidethecoastlineUsingcelestialbodiesUsingwildlifeUsingtheweatherUsingtheseaUsingcelestial

4、bodiestoplotthepositionstoworkoutthelatitudeaspecialcloudformationindicatesthereislandclosebyUsingwildlifeIfseaweedwasfreshandsmelledstrongly,theshipwasclosetoland.Seabirdscouldbeusedtoshowthewaytolandwhenitwasnowheretobeseen.UsingtheweatherfogTohelpidentifytheposit

5、ionofastreamorriverwhen…TodirecttheirsailingUsingnavigationalinstruments1.Findinglongitude2.Findinglatitudethecompassthebearingcircle(方位圆)theastrolabe(星盘)thequadrant(象限仪,四分仪)thesextant(六分仪)Decidewhetherthefollowingstatementsaretrue(T)orfalse(F).1.Anearlymethodofcalc

6、ulatinglongitudewastouseaknottedropetiedtoalog.2.Theastrolabewasthefirstinstrumenttomeasurethesun’sposition.3.Thequadrantwasmorepreciseandsimplifiedthantheastrolabe,butstillhaditsshortcoming.TFT4.Uptillnow,themostaccurateandreliablenavigationalinstrumentisthesextant

7、.5.Theastrolabe,quadrantandsextantaredifferentkindsofnavigationalinstrumentsandtheyhavenothingtodowitheachother.FFLanguagePointWorkout⑴Seeifyoucanworkoutthisbillout.计算弄明白⑵Theplotissocomplicatedthatit’lltakeyouawhiletoworkitout.⑶Ican’tworkoutGeoff;onedayhe’sfriendly,

8、thenextdayheignoresmecompletely.⑷Ihaven’tworkedoutwho’sgongtolookafterthekidstonight.明白计划identifyvt.把…等同于;认出,鉴定,认为同一Iidentifiedthejacketat