— Could you tell me how the sea sand comes about? 

— Sea waves dash against the rock. In this way, the sea sand ___. [ ]

A. comes into use

B. comes into office

C. comes into effect

D. comes into being

消防控制室应设置火灾警报装置与应急广播的控制装置，其控制程序规定：二层及以上的楼房发生火灾，应（）

A.接通所有楼层

B.接通着火层以上的所有楼层

C.先接通着火层及其相邻的上、下层

D.先接通着火层