What impressed me most in his report lies in the words to bring about an _________ of the     conditions of the working men and women．

A．improvement

B．advance

C．increase

D．achievement

中国古代资本主义萌芽的发展严重受阻，其原因包括（）

①封建经济的基础十分顽固

②封建上层建筑的反作用

③旧的经济观念的巨大影响

④社会上缺乏破产的劳动力

A.①②③

B.②③④

C.①②④

D.①②③④