单项选择题

Directions: In the following questions, choose the best answer from the five choices listed.

The Center City Little League is divided into d divisions. Each division has t teams, and each team has p players. How many players are there in the entire league（）

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

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单项选择题
If a is increased by 10% and b is decreased by 10%, the resulting numbers will be equal. What is the ratio of a to b（）

A.A
B.B
C.C
D.D
E.E
单项选择题
For any numbers a, b, and c, For which of the following equations is it true that there is exactly one positive integer that satisfies it’（）

A. none
B. Ⅰ only
C. Ⅲ only
D. Ⅰ and Ⅲ only
E. Ⅰ, Ⅱ, and Ⅲ
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