单项选择题





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单项选择题
C
单项选择题
The figure at the right consists of four semicircles in a large semicircle. If the small semicircles have radii of 1, 2, 3, and 4, what is the perimeter of the shaded region
(A) 10π
(B) 20π
(C)40π
(D)60π
(E) 100π
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