对任意一人非零复数z，定义集合Mz={w|w=zn，n∈N}．（）若集合M z 中只有3个元素，试写出满足条件的一个z值，并说明理由．

治疗的基本措施是（）
A. 急诊手术
B. 禁食和胃肠减压
C. 腹腔穿刺引流
D. 腹腔镜切除胆囊
E. 应用大量广谱抗生素

— Whtre you going to do this weekend — ______, I’m going to visit the Nture Museum.Ifnythin— Wht re you going to do this weekend — ______, I’m going to visit the Nture Museum.Ifnything B．If ever C．If possible D．If busyA．If anythingB．If everC．If possibleD．If busy