()是应急体系的基础和保障，也是开展各项应急活动的依据。
A.组织体制
B.运作机制
C.保障系统
D.法制建设
参考答案：D
— That boy enjoys drawing very much.
—____, I have never seen anyone else who is as enthusiastic about drawing as he is.
A．As long as I have traveled
B．Traveled so much as I have
C．As I have traveled so much
D．Much as I have traveled
超声波
