单选题
Apart from its impact on commercial and industrial structures and procedures, the rapid development of the global communications system is apparently ______ barriers between peoples at a pace neither governments nor international agencies can hope to control.
【正确答案】
D
【答案解析】[分析] 习语辨析及固定搭配
A．setting up 叩设立，竖立；B．triggering off引起，激起；C．breaking up打碎，破碎，分裂 (主要表示使整体分解)；D．breaking down打破，毁掉。break down the barriers表示“改变或除掉阻止人们一起工作或彼此间建立良好关系的事物”，因此答案为D。