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1、Unit4GlobalwarmingI•阅读理解MeasuringaHurricanebySoundUnderwaterThereareacoupleofwaystoforecastthedestructivepotentialofahurricanesothatpeopleinharm,swaycantakeadequateprecautions.Satelliteimagesofcloudpatternscanbeanalyzedtoestimatepeakwindspeeds,buttheestimatesareoftenwa
2、yoffthemark・Specializedaircraftcanflyintoastormtomeasurethewindsdirectly,buttheflightsarecost1y・ResearchersattheMassachusettsInstituteofTechnologycomeupwithathirdway:1isteningtoastormunderwater.InapapertobepublishedinGeophysicalResearchLetters,NicholasC.Makrisandaforme
3、rgraduatestudent,JoshuaD.Wilson,reportastrongconnectionbetweentheintensityofsoundrecordedbyanunderseamicrophoncinthemid-Atlanticandthewindpowerofahurricanethatpassedoverit.Theysaythatsuchmicrophones,knownashydrophones,couldbeasafeandrelativelyinexpensivemeansofestimati
4、nghurricaneforce.Dr.MakrisandDr.Wilson,whoisnowwithAppliedPhysicalSciencesCorporation,workedoutthetheoryofunderwateracoustic（声学的）monitoringofstormsina2013paper."Tobeveryfrankwithyou,it'samysterywhatmakesstormsnoisyunderwater,”Dr>Makrissaid.Themostpopularideacurrentlyis
5、thatithassomethingtodowithoscillatingairbubbles（气泡振动）•Theresearchersthenwentlookingforexperimentaldatatobacktheirtheory,andfounditfromahydrophoncplacedatadepthof2,500feetbytheNationalAtmosphericandOceanicAdministration.IthappenedthatHurricaneGertpassedovertheareainSept
6、ember1999,andahurricane-hunterplanedirectlymeasuredthewindspeedatthesametime.Thehydrophonedatashowedsoundintensityrisingwhenthestorm"soutsidewind"wall”passedover,andagainwhentheinsidewall,themostdestructivepartofthestormneartheeye,passedover・“Wcgotabeautifulcormection,
7、”Dr.Makrissaid,"betweenthehydrophonedataandtheactualwindspeedsasmeasuredbytheaircraft.”Dr>Makrisisconductingadditionalexperiments,workingwiththeMexicanNavyoffthewestcoastofMexico.Theeventualgoal,hesaid,wouldbepermanenthydrophonesinknownhurricane/onesortemporaryonos.tha
8、tcouldboeasilylaidbyplaneorshipinthepathofacomingstorm.1・Whatdoestheunderlinedword"back"inParagraph5mean?A.Support.B.
