单项选择题

The median of the positive integers l，m，n，r，and s is 10，where l＜m＜n＜r＜s．（）

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

The average(arithmetic mean)of x，y，and6 is 3．（）

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

M(r，s，t)denotes the average(arithmetic mean)of，r，s，and t，and M(x，y)denotes the average of x and y．（）

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.