Many experts have realized that the current medical system needs ________ to meet the needs of our

increasingly aging population. [      ]

A. reforming  

B. inspecting

C. forming  

D. achieving

部（分）队接到紧急集合命令（信号），应当迅速而有秩序地按照紧急集合的有关规定，准时到达指定位置，完成战斗或者机动的准备。