Just like fingerprints, each person’s DNA is unless he has a twin.
A. unusual
B. normal
C. various
D. unique
网友回答
A. unusual
B. normal
C. various
(答案→)D. unique
解析：形容词词义辨析。A. unusual 不寻常的 B. normal 正常的 C. various 各种各样的 D. unique 独特的 像指纹一样每个人的DNA是唯一的除非他有双胞胎。选D