【題目】下圖是極地投影示意圖，圖中小虛線圓為極圈，大虛線圓為回歸線；弧線ACB為晨昏線，且AC段為晨線；C點為晨昏線與極圈的切點，也是晨昏線與120°E經線的交點，讀圖回答下列問題。
【1】
A. 3月21日 B. 6月22日
C. 9月23日 D. 12月22日
【2】
A. 開羅（30°N 、31°E） B. 北京（40°N、116°E）
C. 安克雷奇（60°N、150°W） D. 布宜諾斯艾利斯（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】試題分析：
【1】讀圖0°經線與120°E之間順時針方向夾角為120°，可以判斷地球自轉方向為順時針（沿地球自轉方向度數越來越大的為東經度）。該圖為以南極點為中心的俯視圖。由于AC為晨線，BC為昏線，所以120°E為晝半球的中央經線，地方時為12點，南極圈以南地區為極夜，太陽直射點位于北回歸線上，為北半球的夏至日，故選B。
【2】由上題分析可知，此時太陽直射北回歸線，北半球晝長夜短，120°E為地方時12點。開羅位于東二區，為地方時6點，此時為上午，A錯。北京正值正午，B錯。安克雷奇位于150°W，此時為18點，此時接近日落，C錯。布宜諾斯艾利斯位于西四區，此時為0點，正值黑夜，D對。故選D。
【3】由上題分析可知，此時太陽直射北回歸線，攀枝花的正午太陽高度為87度。太陽能熱水器集熱板與太陽光線垂直，效果最好，計算可知，太陽能熱水器與地面的夾角為3°，故選A。
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