单项选择题





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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
单项选择题
In 1988 there were 40,000,000 public school students in the United States, of whom 22% lived in the West. Approximately, how many public school students are projected to be living in the West in 2008
A．9,000,000
B．12,000,000
C．15,000,000
D．24,000,000
E． 66,000,000
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