单项选择题


(A) 5
(B) 10
(C) 15
(D) 25
(E) It cannot be determined from the information given.
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单项选择题
In how many of the years shown was the number of widgets sold at least three times the number of widgets sold in 1960
A．Four
B．Three
C．Two
D．One
E． None
单项选择题
In the preceding figure, each of the four squares has sides of length 2x. If triangle PQR is formed by joining the centers of three of the squares, what is the perimeter of triangle PQR in terms of x
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