单项选择题

In the figure at the right, the legs of fight triangle ACB are diameters of the two semicircles. If AB = 4, what is the sum of the areas of the semicircles

(A) π
(B) 2π
(C) 4π
(D) 8π
(E) 16π

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单项选择题

If in the United States in 1995, there were 50 mil-lion employed adults and 20 million adults not in the the labor force, then approximately what was the ratio of the number of employed adults participating in adult education to the number of people not in the labor force participating in adult education

A．5:4
B．5:2
C．10:3
D．5:1
E． 6:l

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