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【题目】大同市白昼最短时,同学们即将过的节日是 ( )

A.元宵节B.圣诞节C.中秋节D.国庆节

【答案】B

【解析】

地球绕太阳不停的旋转,叫地球的公转,公转的方向是自西向东,周期是一年。地球围绕太阳公转时,地轴与公转轨道的平面成66.5°的固定倾角,这就使得一年内太阳光线的直射点有规律地在南北回归线之间移动。当太阳光线直射赤道时是北半球的春分日或秋分日,此时全球昼夜等长;当太阳光线直射北回归线时是北半球的夏至日,北半球昼长夜短,北极地区出现极昼现象;当太阳光线直射南回归线时是北半球的冬至日,北半球昼短夜长,北极地区出现极夜现象。

当太阳光线直射南回归线时是北半球的冬至日,日期为12月22日前后,北半球昼最短夜最长;此时我们即将过圣诞节(12月25日);故选:B。

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