The Appalachian Trail, extending approximately 2,020 miles from Maine to Georgia, is the longer continuous marked footpath in the world.
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【正确答案】 1、正确答案：longer一longest    
【答案解析】解析：考查最高级。形容词或副词前有the，后有in the world等表示范围一类的短语，应当用最高级形式。此处应将longer改为longest。