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    【题目】关于经线和纬线的叙述正确的是（　　）

    A.所有纬线长度相等B.纬度越高，纬线越长

    C.经线的形状是圆D.经线指示南北方向

    【答案】D

    【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。

    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A错误。

    纬度越高，纬线越短，故B错误。

    经线的形状是半圆，故C错误。

    经线指示南北方向，故D正确。

    故选：D。

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