1.【答案】D【解析】由题意,B={xy=nx}={xx>0},则Cxxs0},故A(B)={--2,-1,0},故选D.外2.【答案】A【解析】由题意,z=i-1(i-1)(+1)m+55-mi,因为z是纯虚数,所以 m-5i_(m-Si)(i+)22m+5=025-m,解得m=-5,故选A.≠02