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    【题目】下列现象由地球自转引起的是（）

    A.我国大部分地区四季分明B.天安门广场升国旗的时间冬季比夏季晚

    C.极地地区有极昼、极夜现象D.时间差现象

    【答案】D

    【解析】

    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。地球在自转的同时还要绕着太阳转动叫地球公转，地球公转的方向是自西向东，公转的周期是一年。地球围绕太阳公转产生了四季变化、正午太阳高度的变化、昼夜长短的变化等。

    地球绕地轴不停转动，叫地球自转，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；地球围绕太阳公转产生了四季变化、正午太阳高度的变化、昼夜长短的变化等。 “我国大部分地区四季分明”、 “天安门广场升国旗的时间冬季比夏季晚”、“极地地区有极昼、极夜现象”是由地球公转产生， “时间差现象”是由地球自转产生。故选：D。

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