问题补充:
When you meet some new words, you can in your dictionary.
A. look it up
B. look up it
C. look them up
D. look up them
答案:
A. look it up
B. look up it
(答案→)C. look them up
D. look up them
解析:本题的含义是当你遇到一些新的单词,你可以在字典中查询它们,look up表示查询,后跟某物,若是名词在up前后都对,若是代词,只能放在up之前,本题为代词,代替前句的复数单词words,故用them。