Unit2SailingtheoceansPeriod1WarmingUp，Prereading&Reading同步精练（人教版选修9，课标通用）时间：45分钟Ⅰ.介、副词填空1．Thevoyagesoftravellersbeforethe17thcenturyshowthattheywerenot________themercy________theseaeventhoughtheydidnothavemodernnavigationalaids.2．Onacleardayespeciallyduringthesummerthesailorscouldusethesunoverhead________middaytonavigateby.3．Thereisaspecialcloudformationwhichindicatesthereislandclose________.4．Anearlymethodofmeasuringspeedinvolvedthrowingaknottedropetied________alogoverthesideoftheship.5．Thenumberofknotsthatwerecounted________afixedperiodoftimegavethespeedoftheshipinnauticalmilesperhour.6．________thiswaytheshipcouldsetastraightcourseeveninthemiddleoftheocean.7．________，itwasawkwardtouseasoneofthepointsofreferencewasthemovingshipitself.8．Astheshiproseandplungedinthewaves,itwas________difficulttobeaccuratewithanyreading.9．Itworks________measuringtheanglebetweentwofixedobjectsoutsidetheshipusingtwomirrors.10．Thisgavetheseamenthelocaltimeandallowedthemtofindtheirlatitude________sea.答案1.at；of2.in3.by4.to5.during6.In7．However8.extremely9.by10.atⅡ.单词拼写1．Thiswasamorep________andsimplifiedversionoftheastrolabe.2．Soseamencouldfollowthebirdstolandeveniftheywereo________andintheopensea.3．Thisseemstohavebeenthefirstandmostusefulformofe________whichcarriedtheminimumamountofrisk.4．Canyouhelpmeu________thefiles?5．Itwasthefirsti________tomeasurethesun'sposition.6．Itwaseasiertohandlebecauseitwasmorep________.7．However,itwasawkwardtouseasoneofthepointsofr________wasthemovingshipitself.8．Onacleardayespeciallyduringthesummerthesailorscouldusethesuno________atmiddaytonavigateby.9．SotheVikingswouldobservethewindsbeforeandduringtheiro________orreturnjourneys.10．Seamenusedittohelpi________thepositionofastreamorriverwhentheywereclosetoland.答案1.precise2.offshore3.exploration4.update5.instrument6.portable7.reference8.overhead9．outward10.identifyⅢ.翻译与仿写1．Thevoyagesoftravellersbeforethe17thcenturyshowthattheywerenotatthemercyoftheseaeventhoughtheydidnothavemodernnavigationalaids.翻译：__________________________________________________________________仿写：他的生命掌握在国王手中。__________________________________________________________________2.Therewasnosecuremethodofmeasuringlongitudeuntilthe17thcenturywhentheBritishsolvedthistheoreticalproblem.翻译：__________________________________________________________________仿写：直到做完作业王林才回家。__________________________________________________________________3.Theycouldusetheheightofthesuntoworkouttheirlatitude.翻译：__________________________________________________________________仿写：这些数字我每次相加都有不同的结果。__________________________________________________________________4．Thisseemstohavebeenthefirstandmostusefulformofexplorationwhichcarriedtheminimumamountofrisk.翻译：__________________________________________________________________仿写：他好像已经知道这次考试结果了。__________________________________________________________________5．Seamenusedittohelpidentifythepositionofastreamorriverwhentheywereclosetoland.翻译：__________________________________________________________________仿写：志愿者们住得离北京大学很近。__________________________________________________________________答案1.17世纪以前的航海记录显示，即使没有现代航海技术的帮助，旅行者们也不是任凭海洋...
