MQ型显影液中M是指（）

A.对苯二胺

B.对苯二酚

C.邻苯二酚

D.米吐尔

E.菲尼酮

If you don’t know how to use the word, you should _________ in a dictionary.

A．look up it

B．look it up

C．look them up

D．look up them