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1、2019-2020年高考英语一轮复习Unit4Globalwarming单元检测卷新人教版选修Ⅰ.阅读理解MeasuringaHurricanebySoundUnderwaterThereareacoupleofwaystoforecastthedestructivepotentialofahurricanesothatpeopleinharm’swaycantakeadequateprecautions.Satelliteimagesofcloudpatternscanbeanalyzedtoestimatepeakwindspeeds,but
2、theestimatesareoftenwayoffthemark.Specializedaircraftcanflyintoastormtomeasurethewindsdirectly,buttheflightsarecostly.ResearchersattheMassachusettsInstituteofTechnologyeupwithathirdway:listeningtoastormunderwater.InapapertobepublishedinGeophysicalResearchLetters,NicholasC.Mak
3、risandaformergraduatestudent,JoshuaD.Wilson,reportastrongconnectionbetweentheintensityofsoundrecordedbyanunderseamicrophoneinthemid-Atlanticandthewindpowerofahurricanethatpassedoverit.Theysaythatsuchmicrophones,knownashydrophones,couldbeasafeandrelativelyinexpensivemeansofest
4、imatinghurricaneforce.Dr.MakrisandDr.Wilson,whoisnowwithAppliedPhysicalSciencesCorporation,workedoutthetheoryofunderwateracoustic（声学的）monitoringofstormsinaxxpaper.“Tobeveryfrankwithyou,it’samysterywhatmakesstormsnoisyunderwater,”Dr.Makrissaid.Themostpopularideacurrentlyisthat
5、ithassomethingtodowithoscillatingairbubbles（气泡振动）.Theresearchersthenwentlookingforexperimentaldatatobacktheirtheory,andfounditfromahydrophoneplacedatadepthof2，500feetbytheNationalAtmosphericandOceanicAdministration.IthappenedthatHurricaneGertpassedovertheareainSeptember1999,a
6、ndahurricane-hunterplanedirectlymeasuredthewindspeedatthesametime.Thehydrophonedatashowedsoundintensityrisingwhenthestorm’soutsidewind“wall”passedover,andagainwhentheinsidewall,themostdestructivepartofthestormneartheeye,passedover.“Wegotabeautifulconnection,”Dr.Makrissaid,“be
7、tweenthehydrophonedataandtheactualwindspeedsasmeasuredbytheaircraft.”Dr.Makrisisconductingadditionalexperiments,workingwiththeMexicanNavyoffthewestcoastofMexico.Theeventualgoal,hesaid,wouldbepermanenthydrophonesinknownhurricanezonesortemporaryonesthatcouldbeeasilylaidbyplaneo
8、rshipinthepathofaingstorm.1.Whatdoestheunderlinedword“back”inParagra
