单项选择题

In the figure below, three circles of radius 1 are tangent to one another. What is the area of the shaded region between them（）

A.A
B.B
C.C
D.D
E.E

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单项选择题
At Leo's Lumberyard, an 8-foot long wooden pole costs $3.00. At this rate, what is the cost, in cents, of a pole that is 16 inches long（）

A、0.5
B、48
C、50
D、64
E、96
单项选择题
In the figure below, if the radius of circle O is 10, what is the length of diagonal AC of rectangle OABC（）

A.A
B.B
C.C
D.D
E.E
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