教材文本 unit 2 comprehending

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1、Unit2SailingtheOceansComprehending1Readthepassageandanswerthefollowingquestions.1Whatistheuseofabeatingcircle,astrolabe,quadrantorsextant?()Whatistheuseofacompass?()AtosetthecourseoftheshipBtomeasurethepositionoftheshipCtomeasurethespeedoftheshipDtotellthetime2Whyarespeedandtimeimportantinw

2、orkingoutthelongitudeofaship?3Whyisthepositionofthesunandvariousstarsusefulforworkingoutlatitude?2SupposeyouwereaseacaptainaimingtosailroundAfrica.Discussingroups:1Whatskillswouldyouseekinyoursailors?2Whatproblemswouldyouanticipateforthisjourney?3Whatwouldyoudoifyoucameacrossthefollowingpro

3、blemsduringyourvoyage?Readthecharbelowandfillinyourplansofactiontodealwiththem.Whatwouldyoudoif:PlanofactionYouwerefarfromlandandastormarose.Youknewyourlatitudebutdidn’tknowyourlongitude.Youwereblownoff-course.Youwereoffshorebutyouneededmorefoodandwater.Youwantedtokeepastraightcourse.Youwer

4、elostwithnolandinsight.4Readthepassageagainandusetheinformationtoanalysethenavigationalskills.Writetheanswersinyourownwords.Usingnature1Tofindtheship’spositionatseaasailorusedtheNorthStarandthesun.2Asailorknewthatlandwasnearbyifhesaw________________________3Sailorsused_______________toincre

5、asetheirspeed.Usinginstruments4Thereweretwomethodstofindlongitude:1________________________2__________________________5Writedowntheworkingprinciplesofthefollowinginstruments:●Bearingcircle:_______________________________●Astrolabe:_______________________________●Quadrant:___________________

6、____________●Sextant:_______________________________5Imagineyouareonaboatwithtwenty-nineotherpeople.Youhaveasmallboxforyourpersonalthingsbutitcanonlyholdtenitems.Whatwouldyouneedforaweek’sjourneyacrosstheNorthSeatoEngland?CategoryItemsCategoryItemsClothesShoesHygieneToolsBeddingMedicinesDis

7、cussyourlistwithyourpartnerandcombinethetwosetsofchoicestomakeathirdandbetterlist.Bepreparedtojustifyyourchoicestotheclass.AnswerkeyforExercise1:1BA2Speedandtimeareimportantinfindingoutthelongitudeofashipbecausetheearthmovesfifteendegreeswestwardseveryho