精英家教网 > 高中英语 > 题目详情
Just like fingerprints, each person’s DNA is ________unless he has a twin.
A.unusualB.normalC.variousD.unique
D
词义辨析. Unusual不同寻常的;normal普通的,一般的;various各种各样的;unique独特的,稀罕的.句意:就像指纹一样,每个人的DNA都是独特的,除非他有一个孪生兄妹.故选D.
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