单选题 Convergence of satellite and terrestrial telephony is certain to deepen as the technical hurdles of multi-standard handset development and infrastructure integration fall.
【正确答案】 B
【答案解析】[分析] 名词辨析 hurdles篱笆，栏，障碍，跨栏；A．initiatives 主动，积极性，优先权；B．obstacles障碍，妨害物；C．warnings警告，预告；D．orders 次序，正常(工作)状态；因此B为答案。