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【题目】关于经线和纬线叙述正确的是( )

A. 所有经线都相互平行B. 纬度越低,纬线越长

C. 经线和纬线的长度相等D. 纬线指示南北方向

【答案】B

【解析】

根据经线是连接南北两极并同纬线垂直相交的半圆,也称子午线。经线指示南北方向;所有经线都呈半圆状且长度相等;两条正相对的经线形成一个经线圈;任何一个经线圈都能把地球平分为两个半球。纬线是在地球仪上,顺着东西方向,环绕地球仪一周的圆圈。所有的纬线都相互平行,并与经线垂直,纬线指示东西方向。纬线圈的大小不等,赤道为最大的纬线圈,从赤道向两极纬线圈逐渐缩小,到南、北两极缩小为点,进行分析解答。

经线是连接南北两极并同纬线垂直相交的半圆,所有经线都与本初子午线相交于南北两极,故A错误;

纬线圈的大小不等,赤道为最大的纬线圈,从赤道向两极纬线圈逐渐缩小,到南、北两极缩小为点,故B正确;

每条经线的长度都相等,每条纬线的长度不相等(相同纬度的除外),故C错误;

经线指示南北方向;纬线指示东西方向;故D错误。

故选:B

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