单项选择题

If the radius of a circular region were decreased by 20 percent, the area of the circular region would decrease by what percent（）

A. 16%
B. 20%
C. 36%
D. 40%
E. 44%

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单项选择题

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

单项选择题

a and b are positive integers（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.