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

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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)

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