单选题 It is ironic that the ______ insights of the great thinkers are voiced so often that they have become mere

【正确答案】 A

【答案解析】original…clich6s“原始的，独创的……陈词滥调”；banal…beliefs“陈腐的……信仰”；dubious…habits“可疑的……习惯”；philosophical…questions“哲学的……问题”。根据句意和各个选项的意思可知，正确答案是A。