When we meet some new words, we'd better ______ in a dictionary.[ ]

A. look out them

B. look them out

C. look them up

D. look up them

对于大型吊灯的安装方式为( )。

A．必须单独设吊筋安装

B．固定在主龙骨上

C．固定在次龙骨上

D．固定在面层上