题目

Jack is one of those men who_________ best evening the most difficult situations. A. his       B. your       C. their       D. one's   答案：C本题是一道相对比较难的题。关键是理解who引导的定语从句先行词是those men。设z1=2-i，z2=1-3i，则虚数z=iz1+.z25的实部为00．