Mike came here _____ to see you, _____ after he heard that you had retumed from abroad. [ ]

A. especially; specially

B. especially; especially

C. specially; especially

D. specially; mainly

“我们要有计划、有选择地引进资本主义国家的先进技术和其他文明有益的东西，但是我们决不学习和引进资本主义制度，决不学习和引进各种丑恶颓废的东西。……我们要向人民特别是青年介绍资本主义国家中先进和有益的东西，批判资本主义国家中反动和腐朽的东西。” 请回答，这段话体现了唯物辩证法的什么原理？