[题目]科尔沁地区在清朝康熙年间还是牧草丰盛的著名牧区.现在已是我国荒漠化最严重的地区之一.对我国华北地区有严重的潜在威胁.下表反映了50年来科尔沁沙地重心转移的情况.据此完成下列各题.年份1949年1955年1960年1970年东经121.97°121.93°121.94°121.88°北纬43.57°43.51°43.54°43.59°年份1978年1985年199 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】科尔沁地区在清朝康熙年间还是牧草丰盛的著名牧区，现在已是我国荒漠化最严重的地区之一，对我国华北地区有严重的潜在威胁，下表反映了50年来科尔沁沙地重心转移的情况。据此完成下列各题。

年份	1949年	1955年	1960年	1970年
东经	121.97°	121.93°	121.94°	121.88°
北纬	43.57°	43.51°	43.54°	43.59°
年份	1978年	1985年	1990年	1995年
东经	121.86°	121.75°	121.80°	121.71°
北纬	43.69°	43.80°	43.68°	43.84°

【1】从整体上看，科尔沁沙地重心移动的方向是

A．向东南方向移动 B．向东北方向移动

C．向西北方向移动 D．向西南方向移动

【2】导致科尔沁草原沙化土地出现连片发展趋势的主要原因是

A．水资源利用不当 B．过度樵采，破坏固沙植物

C．严重超载放牧 D．农牧交错带的过度垦殖

【答案】

【1】C

【2】D

【解析】

试题分析：

【1】根据表格中的经纬度，从整体上看，科尔沁沙地重心移动的方向是向西北方向移动，C对。A、B、D错。

【2】导致科尔沁草原沙化土地出现连片发展趋势的主要原因是农牧交错带的过度垦殖，破坏草地植被，导致沙漠化土地面积增大，D对。水资源利用不当可能导致盐碱化，A错。过度樵采，破坏固沙植物，主要出现在林区，B错。结合问题发生的年代，主要是扩大耕地面积，严重超载放牧不是主要原因，C错。

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