单项选择题

（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D.if the relationship cannot be determined from the information given.

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单项选择题

x and y are positive numbers．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D.if the relationship cannot be determined from the information given.

单项选择题

Fn=2(2n)+1 for any nonnegative integer n．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D.if the relationship cannot be determined from the information given.