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    【题目】下图是极地投影示意图，图中小虚线圆为极圈，大虚线圆为回归线；弧线ACB为晨昏线，且AC段为晨线；C点为晨昏线与极圈的切点，也是晨昏线与120°E经线的交点，读图回答下列问题。

    【1】

    A. 3月21日 B. 6月22日

    C. 9月23日 D. 12月22日

    【2】

    A. 开罗（30°N 、31°E） B. 北京（40°N、116°E）

    C. 安克雷奇（60°N、150°W） D. 布宜诺斯艾利斯（34°S、59°W）

    【3】

    A. 3° B. 23.5° C. 26.5 ° D. 87°

    【答案】

    【1】B

    【2】D

    【3】A

    【解析】试题分析：

    【1】读图0°经线与120°E之间顺时针方向夹角为120°，可以判断地球自转方向为顺时针（沿地球自转方向度数越来越大的为东经度）。该图为以南极点为中心的俯视图。由于AC为晨线，BC为昏线，所以120°E为昼半球的中央经线，地方时为12点，南极圈以南地区为极夜，太阳直射点位于北回归线上，为北半球的夏至日，故选B。

    【2】由上题分析可知，此时太阳直射北回归线，北半球昼长夜短，120°E为地方时12点。开罗位于东二区，为地方时6点，此时为上午，A错。北京正值正午，B错。安克雷奇位于150°W，此时为18点，此时接近日落，C错。布宜诺斯艾利斯位于西四区，此时为0点，正值黑夜，D对。故选D。

    【3】由上题分析可知，此时太阳直射北回归线，攀枝花的正午太阳高度为87度。太阳能热水器集热板与太阳光线垂直，效果最好，计算可知，太阳能热水器与地面的夹角为3°，故选A。

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