单项选择题

As two wheels--A and B--roll across the ground, they both rotate at a rate of 60 revolutions per second. The radius of wheel A is 3. The radius of wheel B is 1.5.（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

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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

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