单项选择题A．They have known each other since their schooldays. B．They were both chairpersons of the students’ union. C．They have been in close touch by email. D．They are going to hold a reunion party.

单项选择题A．They force people to follow the cultural mainstream. B．They exaggerate the roles of certain groups of people. C．They emphasize diversity at the expense of uniformity. D．They hinder our perception of individual differences.