第18题: [单项选择]For some time now, ______ has been presumed not to exist: the cynical conviction that everybody has an angle is considered wisdom. A. rationality B. flexibility C. disinterestedness D. insincerity 参考答案:C 答案解析:(disinterestedness无私)。句意为:如今,无私被认为是根本不存在的东西。人人都有自私的动机这种悲观的信念被认为是至理名言。A.rationality合理性;B.flexibility灵