单项选择题

When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students（）

A. 6.5
B. 6.75
C. 7.0
D. 7.25
E. 7.5

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单项选择题

Approximately how many million dollars more did the wholesale sector contribute to the arts in 1988 than in 1991（）

A. 10.4
B. 12.6
C. 14.0
D. 16.5
E. 19.2

单项选择题

（）

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.