阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。
God’s Coffee
A group of class friends, highly established in their careers, got together to visit their old university professor . Conversation soon __36__ into complaints about stress in work and life.
Offering his guests coffee, the professor went to the __37__ and returned with a large pot of coffee and a couple of __38__ —porcelain, plastic, glass, crystal, some __39__ looking, some expensive, some delicate---telling them to __40__ themselves to the coffee
When all the students had a cup of coffee in __41__ the professor said, “If you noticed, all the nice looking expensive cups were taken up, __42__ behind the plain and cheap ones. While it is normal for you to__43__ only
