Don’t be afraid of new words. You can in the dictionary.
A. look at them
B. look for them
C. look them up
D. look them over
网友回答
A. look at them
B. look for them
(答案→)C. look them up
D. look them over
解析：词组辨析。look at 意为“看”；look for意为“寻找”；look up意为“在…（工具书）中查找”；look over意为“检查，察看”。根据句意：不要担心生词，你可以在字典中查找它们。故C为正确答案。