单项选择题

In the coordinate plane，points A and B are endpoints of a diameter of a circle with center(-2，1)．If the coordinates of A are(-5，5)，what are the coordinates of B（）

A. (0，0)
B. (3，-2)
C. (3，-1)
D. (2，-2)
E. (1，-3)

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What fraction of a cubic meter is the volume of a cubic block Of stone with edge of length 10 centimeters（）(1 meter=100centimeters)

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单项选择题
What is the ratio of the perimeter of a pentagon with each side of length 6 to the perimeter of an octagon with each side of length 6（）

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