单项选择题

If A is the point (-4, 1) and B is the point (2, 1), what is the area of the circle which has AB as a diameter（）

A. 3π
B. 6π
C. 9π
D. 12π
E. 36π

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单项选择题
The second and third sentences are characterized, respectively, by
A. warning and justification
B. generalization and specification
C. invocation and definition
D. authority and reverence
E. confession and resolution
单项选择题
In 1980, the cost ofp pounds of potatoes was d dollars. In 1990, the cost of 2p pounds of potatoes was dollars. By what percent did the price of potatoes decrease from 1980 to 1990（）

A. 25%
B. 50%
C. 75%
D. 100%
E. 400%
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