If you can’t read the new words, you may in the dictionary.
A. look it up
B. look up it
C. look them up
D. look up them
网友回答
A. look it up
B. look up it
(答案→)C. look them up
D. look up them
解析：考察动词短语。句意：如果你不能读这个新单词，你可以在词典中查阅它。结合语境可知此处代词指代前文提到的这些新单词，故用复数形式。当短语由动词（vt.）+副词构成，此类短语可以带宾语，宾语若是名词，放在副词前后皆可；宾语若是人称代词，只能放在副词的前面。故选C。