由直线x=-2，x=2，y=0及曲线所围成的平面图形的面积为 A. �

由直线x=-2，x=2，y=0及曲线所围成的平面图形的面积为

A. B. C. D.

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由直线x=-2，x=2，y=0及曲线所围成的平面图形的面积为 A. �

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