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【题目】不同类型的区域划分,有不同的地理界线。下列说法正确的是 ( )

A. 昆仑山脉是我国地势第二、三级阶梯的分界线

B. 秦岭一淮河是温带季风气候和亚热带季风气候的分界线

C. 黑河一腾冲线以西人口稠密,以东人口稀疏

D. 400毫米等降水量线是我国湿润区和半湿润区的分界线

【答案】B

【解析】

试题

在学习地理的过程中,地理区域和地理界线是非常重要的。地理区域体现了区域内部的地理相似性,地理界线反映出区域之间的地理差异性。我国第二阶梯和第三阶梯的分界山脉是大兴安岭、太行山、巫山、雪峰山一线;秦岭、淮河一线是我国东部地区重要的地理界线,它是我国一月份0℃等温线通过的地方,800mm等降水线通过的地方,温度带中,暖温带与亚热带分界线,干湿地区中,湿润区与半湿润区分界线;我国黑河-腾冲线以东人口密集,以西人口稀少;800mm年等降水量线(秦岭--淮河一线)是我国旱地与水田的分界线,故本题选B

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