单项选择题
In the figure above，O and P are the centers of two circles．If each circle has radius r，what is the area of the shaded region（）
A.A
B.B
C.C
D.D
E.E
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试题
单项选择题
In the figure above，O and P are the centers of two circles．If each circle has radius r，what is the area of the shaded region（）
A.A
B.B
C.C
D.D
E.E