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1、IsElNinoBack?TherearesignsthatElNino,themassivewarmingofthePacificOceanthataffectstheworld'sweather,maybeformingagain.Asatelliteorbiting600milesabovethePacificOceanpickedupastreakofwarmwaterformingalongtheequator—anearlysignofthephenomenonfeltaroundt
2、heworldwhenitlastappeared,justfouryearsago.Itismorethan3,000mileslong.Thewaterinitisninedegreeswarmerthaninsurroundingareas—asubstantialnumbertooceanographers.Thewarmpoolisgrowingandhascausedgovernmentforecasterstoputoutanadvisory(气象报告)."It'saheads-u
3、pinadvancesothatpeoplecanproperlybepreparedforthisevent."saidVernonKouskyoftheNationalOceanicandAtmosphericAdministration'sClimatePredictionCenter.Ifafull-blownElNinodoesform,Americanswouldmostlikelystarttofeelitseffectsnextfallandwinter.Thegovernmen
4、tcalledtheforecastverypreliminary—butthewarningallowsemergencyagenciestomakeplans."Rightnow,wecan'tpredictwhetheritwillbeweak,moderateorstronginintensity/'saidKousky.Somescientistssayit'stooearlytopredictanythingatall."I'dbeverycareful,"saidonewhoask
5、ednottobenamed."Thereisindeedaverylargeanomaly(反常状态)inthePacificrightnow,andweneedtowatchit.Butthesethingsareverydifficulttoforecast."ElNinoscanbebothgoodandbad,dependingonwhereyouare.Evenarelativelysmallonecanbringaboutsignificantchangesbyshiftingth
6、ewindpatternsfromthePacificOceanthatpassovertheUnitedStates.DuringthelastElNino,in1997and1998,rainfalldoubledinCalifornia,causinga$1billioninstormdamage.Ontheotherhand,inFlorida,forestfireswereputoutbytheextrarain.Choosethebestanswerstothefollowingqu
7、estions.1.WhatcanberegardedasanearlysignofElNino?A.A3,000-milelongwaterstreak.B.Awaterstreakthatiswarmerthansurroundingareas.A.Astreakofwaterformingalongtheequator.B.Ahugewarmwaterstreakalongtheequator.2."Thewarmpool"inthethirdparagraphrefersto.A.the
8、PacificOceanBthe3,000-milelongwarmwaterstreakC.theAtlanticOceanD.anewElNino3.WhyisitnecessarytoforecastthecorningElNino?A.BecauseitwouldaffectAmericansnextfallandwinter.B.Becausescientistswillbeabletoknowwhetheritwillbeweak,moderateorstronginintensit
