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    【题目】地理观测是学习地理要掌握的基本技能。长春某中学的地理兴趣学习小组每天12:00准时观测记录学校旗杆影子的长度,他们发现不同季节影子的长度不同,其原因是( )

    A.地球自转B.地球公转C.地球形状D.地球大小

    【答案】B

    【解析】

    根据地球绕地轴不停转动，叫地球自转。地球自转的方向是自西向东，自转的周期是一天。地球自转产生的现象是昼夜交替、日月星辰东升西落和时间差异。地球公转的周期是一年，方向是自西向东，公转的中心是太阳，公转产生的现象有季节的变化、昼夜长短的变化、五带的产生、正午太阳高度的变化等，进行分析解答。

    由于地球在自转的同时，不停围绕着太阳进行公转，太阳直射点在南北回归线之间来回移动，所以季节不同，旗杆的影长不同。故选：B。

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