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答案：
C
【答案】C
思路】(A)x≠0 且 x>y, 假設x=3,y=2, 6+k≠k;
(B) X+Y=0, 且x≠0,假設x=3, y=-3,-9+k≠k
(D) |x - y | = 0且x≠0,假設x=3,y=3,9+k≠k
(E) xy = 1且x≠0,假設x=3,y=1/3 , 1+k≠k
(C)y=0, 且x≠0,則xy=0,thus xy + k = k must be true 
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