单项选择题

A printer numbered consecutively the pages of a book，beginning with 1 on the first page．In numbering the pages，he printed a total of 189 digits．（）

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 the relationship cannot be determined from the information given.

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单项选择题

When the even integer n is divided by 7，the remainder is 3．（）

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 the relationship cannot be determined from the information given.

单项选择题

n is a positive integer．（）

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 the relationship cannot be determined from the information given.