单选题 Because there are many hills and lots of snow in the northern part of the country, it has the highest ______ of ski resorts.
【正确答案】 A
【答案解析】[解析] 词汇：名词
1．这是一道词汇题，选项均由名词构成。
2．原文意思是“有很多滑雪胜地”，concentration意为“集中、浓缩”，因此A项为正确选项。