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xx年6月英语四级选词填空技巧技巧练习xx年6月英语四级选词填空技巧技巧练习 EI Ninois thename givento themysterious andoften unpredictablechange in the climateof theworld.This strange47happens everyfive toeight years.It startsinthepacific Oceanand isthought tobe causedby afailure inthe trade winds信风,which affectsthe oceancurrents drivenby thesewinds.As thetradewindslessen in48,the oceantemperatures rise,causing thePeru currentflowing infrom theeast towarm upby asmuch as5℃degrees centigrade. The warningof the ocean hasfar-reaching effects.The hot,humid潮湿的air overtheoceancauses severe49thunderstorms.The rainfallis increasedacross SouthAmerica,50floods toPeru.In theWest Pacific,there aredroughts affectingAustralia andIndonesia.So whilesome partsof theworld preparefor heavyrains andfloods,other partsface drought,poor cropsand
51. EI Ninousually lastsfor about18months.The1982-83EI Ninobrought themost52weather inmodern his...。