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阅读材料,完成下列要求。 材料一 唐代交通比秦汉时有进步,且为所不及。交通干路往还交织,干路之长至少应在二万五千里以至二万六千里。一千六百三十九所,驿三十里一置。据《郡县志》载,上都(长安)与各州之间通道,各方路线俱自长安辐射。唐代运河的使用,提高了东南诸郡在全国的地位,在交通史上具有划时代的意义,唐朝的域外交通,“入四夷之路,最要者七”,尤其是安西入西域道、安南通天竺道以及广州夷道,路线最远。 —— 摘编自白寿彝《中国交通史》 (1) 根据材料一并结合所学知识,概括唐代交通发展的特点并原因。 (12 分 )
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