单项选择题



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单项选择题
Given that x ≠ y and that (x - y)2 = (x + y)2, which of the following must be true Ⅰ.x+y=x-y Ⅱ.y = 0 Ⅲ. xy = 0
(A) None
(B) Ⅱ only
(C) Ⅲ only
(D) Ⅰ and Ⅲ
(E) Ⅰ, Ⅱ, and Ⅲ
单项选择题
In which presidential election between 1972 to 1996 inclusive, was the percent of votes received by the winning candidate the lowest
A．1976
B．1980
C．1988
D．1992
E． 1996
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