题目

Ireland:Beauty and a Long History of SeparationIreland is home to ancient kings and chiefs, giants and fairies. For years it has existed as two Irelands, and Brexit could worsen that division. Discover the lively cities of Dublin and Belfast, and taste pints, drink a whiskey or eat fresh oysters.Journey HighlightsMeet storytellers and experts for insight into the true story of Ireland’s history.Get the full taste of Ireland, experiencing seaweed, oysters and whiskey.Swiss Family Adventure: An Active Journey Through the Alps.The Swiss Alps are the perfect family playground, providing a fun an已知AB＝AC，DB＝DE，∠BAC＝∠BDE＝α．1.如图1，α＝60°，探究线段CE与AD的数量关系，并加以证明；2.如图2，α＝120°，探究线段CE与AD的数量关系，并说明理由；3.如图3，结合上面的活动经验探究线段CE与AD的数量关系为__________    ．（直接写出答案）．