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一、单项选择题(本大题共25道小题,每小题2分,每小题只有一个正确选项)读图1,图中等值线为地球自转线速度等值线,完成1～3题。
A single choice (the big problem a total of 25 small problems, each small problem 2 points, each small problem only one correct option) read Figure 1, the figure is the contour line of Earth’s rotational velocity contours to complete 1 to 3 question.