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1、Scatteredaroundtheglobearemorethan100smallregionsofisolatedvolcanicactivityknowntogeologistsashotspots.Unlikemostoftheworld’svolcanoes,theyarenotalwaysfoundattheboundariesofthegreatdriftingplatesthatmakeuptheearth’ssurface;onthecontrary,manyofthemliedeepintheinterio
2、rofaplate.Mostofthehotspotsmoveonlyslowly,andinsomecasesthemovementoftheplatespastthemhaslefttrailsofdeadvolcanoes.Thehotspotsandtheirvolcanictrailsaremilestonesthatmarkthepassageoftheplates.1）Cigarettesmokingburdenstheheartandisoneoftheleadingcausesofheartattacks.2
3、）Serioushealthproblems,inspiteofmedicaladvancement,stillplaguemillionsofAmericanseachyear.3）Oneofthemostserioushealthproblems,heartattack,couldbecontrolledifpeoplewerewillingtochangetheirbehavior.1）Astudyofthesciencesrevealsmanythingsaboutourhistory.2）Oneearlycivili
4、zationinCentralAmerican,theMaya,wasdiscoveredbyarcheologists.3）ItisnowknownthattheMayanshadmanymedicaltechniquessimilartomodern-daypractices.4）Archaeology,onebranchofthesciences,attemptstorevealthingsaboutearlycivilizations.1）Dr.MyersandDr.Wormarguethattheirworkgive
5、sacorrectbaseline,whichfuturemanagementeffortsmusttakeintoaccount.Theybelievethedatasupportanideacurrentamongmarinebiologists,thatofthe“shiftingbaseline.”Thenotionisthatpeoplehavefailedtodetectthemassivechangeswhichhavehappenedintheoceanbecausetheyhavebeenlookingbac
6、konlyarelativelyshorttimeintothepast.Thatmattersbecausetheorysuggeststhatthemaximumsustainableyieldthatcanbecroppedfromafisherycomeswhenthebiomassofatargetspeciesisabout50%ofitsoriginallevels.Mostfisheriesarewellbelowthat,whichisabadwaytodobusiness.34.Dr.Myersandoth
7、erresearchersholdthat________.[A]peopleshouldlookforabaselinethatcanworkforalongertime[B]fisheriesshouldkeeptheiryieldsbelow50%ofthebiomass[C]theoceanbiomassshouldberestoredtoitsoriginallevel[D]peopleshouldadjustthefishingbaselinetothechangingsituation2）Scientistsmu
8、stcommunicatetheirmessagetothepublicinacompassionate,understandableway--inhumanterms,notinthelanguageofmolecularbiology.Weneedtomakecleart
