单项选择题

Two competitors battle each other in each match of a tournament with nine participants. What is the minimum number of matches that must occur for every competitor to battle every other competitor（）

A. 27
B. 36
C. 45
D. 64
E. 81

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单项选择题
At the time during year X when the aggregate price of ABC and XYZ stock was the greatest, the price of ABC stock was approximately what percent of the price of XYZ stock（）

A. 25
B. 60
C. 70
D. 140
E. 170
单项选择题
A certain five-member committee must be assembled from a pool of five women -- A. B, C, D and E, and three men-- X, Y, and Z, what is the probability that the committee will incIude B, C, E, Y and Z（）

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