考试数学题,
1.已知复数z=1-i,则z^2/z-1=
(A)2 (B)-2 (C)2i (D)-2i
2.已知全集U={-1,0,1,2},集合
A={-2,2},B={0,2},则(CuA)交于B=
(A){0} (B){2} (C){0,1,2} (D){空集}