If you don’t know how to read new words them in a dictionary. A. look forB. look after

问题补充：

If you don’t know how to read new words, them in a dictionary.

A. look, for

B. look, after

C. look, at

D. look, up

答案：

A. look, for

B. look, after

C. look, at

(答案→)D. look, up

解析：句意：如果你不知道如何读新单词，就查阅字典。look up 查阅字典，look for寻找，look after照顾，look at 看一看，故选D