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When you don’t know some words in reading, it is not a good idea              in a dictionary at once.
A.make up themB.looking up them
C.to make them upD.look them up
答案:C
试题分析:look sth up in a dictionary表示固定词组查字典,如果是代词必须放在中间;
句意:当你在读书的时候不知道一些新的单词时,立刻查字典不是一个好主意,结合句意,故选C
考点:考查动词短语辨析。