应急通信系统必须有效地满足指挥调度等应急通信保障需求。
参考答案：对
There _____ a lot of good news in today's newspaper.[ ]
A. is
B. are
C. was
D. were
黄河发源于______高原的______山，呈巨大的“______”字形，曲折流入______海．
