单项选择题

Rectangle PQRS lies in the xy-coordinate plane so that its sides are not parallel to the axes. What is the product of the slopes of all four Sides of rectangle PQRS

(A) -2
(B) -1
(C) 0
(D) 1
(E) 2

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单项选择题

Directions for Quantitative Comparison Questions: Some of the following questions give you two quantities, one in Column A and one in Column B, Compare the two quantities and choose one of the following answer choices:（）

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 you cannot determine the relationship based on the given information

单项选择题

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 you cannot determine the relationship based on the given information