Just like fingerprints, each person’s DNA is ________unless he has a twin．
A．unusualB．normalC．variousD．unique
D
詞義辨析. Unusual不同尋常的;normal普通的,一般的;various各種各樣的;unique獨特的,稀罕的.句意:就像指紋一樣,每個人的DNA都是獨特的,除非他有一個孿生兄妹.故選D.
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