If you don't know how to spell new words, ____ in the dictionary. [ ]

A. look up them

B. look for them

C. look them up

D. look them for

按施工现场安全防护布置要求，扑救电气火灾不得用水，应使用( )。

A．干冰灭火器
B．二氧化碳灭火器
C．泡沫灭火器
D．干粉灭火器