In order to evaluate the effect that the computer has ____ people's life, they have handed out

questionnaires to more than one thousand young citizens, all of_____ picked out at random. [ ]

A. on; whom

B. for; them

C. in; whom

D. on; them

低渗性缺水时，在血清钠尚未明显降低之前，尿钠含量（）

A.正常

B.略高

C.时高时低

D.逐渐升高

E.减少