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    【题目】假如有四个人同时从北极出发，分别沿0°、90°E、90°W和180°四条经线匀速前进，则()

    A. 前进的方向相同，在赤道处会合

    B. 前进的方向相同，在南极会合

    C. 前进的方向不相同，但在南极会合

    D. 前进的方向不相同，但在赤道会合

    【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，指示南北方向。由此可判定，四人同时从北极出发，分别沿0°、90°E、90°W和180°经线匀速前进，那么他们前进方向相同，都是向正南方向前进，在赤道上他们的距离最远，都在南极点会合。依据题意。

    故选：B。

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