You'll find this map of great ( )in helping you to get round

答案为C.本题考查特定语境中名词的词义及“be of + 抽象名词”结构.Price (价格),cost（价钱,费用,成本）不符合题意,value作“quality of being useful or desirable”解时,常与of搭配,在句中作表语或补语,意为“有用,有价值”.故选择value.注意名词词义辨异及惯用法表达,题中“of + 抽象名词”相当于该名词的形容词形式.