单项选择题

Points P．R，and T lie on a straight line．The distance from P to R is 21．and the distance from P to T is 9．
The distance
（）

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（）

单项选择题The boundaries of regions X and y are parallelograms．（）

Points P．R，and T lie on a straight line．The distance from P to R is 21．and the distance from P to T is 9． The distance （）

Points P．R，and T lie on a straight line．The distance from P to R is 21．and the distance from P to T is 9．
The distance
（）