EINinoisthenamegiventothemysteriousandoftenunpredictablechangeintheclimateoftheworld.Thisstrange47happenseveryfivetoeightyears.ItstartsinthepacificOceanandisthoughttobecausedbyafailureinthetradewinds(信风),whichaffectstheoceancurrentsdrivenbythesewinds.Asthetradewindslessenin48,theoceantemperaturesrise,causingthePerucurrentflowinginfromtheeasttowarmupbyasmuchas5℃(degreescentigrade).
Thewarningoftheoceanhasfar-reachingeffects.Thehot,humid(潮湿的)airovertheoceancausessevere49thunderstorms.TherainfallisincreasedacrossSouthAmerica,50floodstoPeru.IntheWestPacific,therearedroughtsaffectingAustraliaandIndonesia.Sowhilesomepartsoftheworldprepareforheavyrainsandfloods,otherpartsfacedrought,poorcropsand51.
EINinousuallylastsforabout18months.The1982-83EINinobroughtthemost52weatherinmodernhistory.Itseffectwasworldwideanditleftmorethan2,000peopledeadandcausedovereightbillionpounds53ofdamage.The1990EINinolasteduntilJune1995.Scientists54thistobethelongestEINinofor2,000years.
Nowadays,weatherexpertsareabletoforecastwhenanEINinowill55,buttheyarestillnot56surewhatleadstoitorwhataffectshowstrongitwillbe.
其选项如下:
I)completely;J)destructive;