题目

       Jascha Richter once sang “don't need too much talking without saying anything” to reveal his lonely feeling in a crowd．        Dad always told me never to ever reveal my true opinions towards other people if such opinions are negative．He said this is the “Chu Shi Zhe Xue”, the philosophy of dealing with social network．        It seems that everybody here just follows this philosophy very, very well．        Friends．I would say that if I were given true friendship I would definitely treasure it with my greatest care．If I really regard someone as 设，则是的（    ） A．充分但不必要条件    B．必要但不充分条件 C．充要条件            D．既不充分也不必要条件