— It is said that in the future human beings will have to live in the sky or under the water.  

— ______!You don't really believe that, do you?     [ ]

A. It depends    

B. Go ahead        

C. Oh, come on    

D. That's great

某井要求一次同时射开30m油层，只能采用（）射孔方式。

A、电缆输送式

B、油管输送式

C、过油管

D、正压