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 it is impossible to determine which quantity is greater

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单项选择题

If x+y=a,y+z=b, andx+z=c, whatisthe average (arithmetic mean) of x, y, and z？（）

A.A
B.B
C.C
D.D
E.E

单项选择题

Which of the following points lies in the interior of the circle whose radius is 10 and whose center is at the origin（）

A. (-9, 4)
B. (5,-9)
C. (0,-10)
D. (10,-1)
E. (-6, 8)