单选题 The idea of a balanced diet is hard to ______ to those who know nothing about nutriology.

【正确答案】 A

【答案解析】(put across使被接受，使被理解)。句意为：很难让那些对营养学一无所知的人接受饮食均衡的观念。B．put through为……接通电话；C．put down放下，拒绝，镇压；D．put forward提出。