When you are confused about some words in reading, you can the dictionary.
A. have a look at
B. look up
C. check
D. refer to
网友回答
A. have a look at
B. look up
C. check
(答案→)D. refer to
解析：此题主要考查look up与refer to 的区别，look up 查字典，宾语是具体的内容，如：word, refer to 的宾语是工具，题中的宾语为the dictionary是工具，所以用refer to，选D。