Please turn _________the radio. Don't wake the baby up. He is_________ .  [ ]

A. over; sleeping    

B. out; sleepy  

C. down; sleep      

D. down; asleep

概念（）之间属于上下位关系。

A.家用电器与电视机

B.局域网与LAN

C.计算机与电脑

D.硅酸盐与陶瓷