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    【题目】（题文）下列关于经纬线的叙述，正确的是(　　)

    A. 所有的经线都平行 B. 本初子午线是东经、西经的分界线

    C. 经线、纬线长度相等 D. 经线指示东西方向

    【答案】B

    【解析】

    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。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。

    所有的经线都相交在南北极点上，故A错误；本初子午线是0°经线，是东经、西经的分界线，故B正确；纬线长度不相等，从赤道向南北两极逐渐变短，故C错误；经线指示南北方向，不是东西方向，故D错误；故选B。

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