单选题:关于21-三体综合征临床特征,以下哪项不正确

题目内容:
关于21-三体综合征临床特征,以下哪项不正确 A.智力落后
B.舌常伸出口外
C.眼距宽,眼外眦上斜
D.骨龄落后
E.身材高大,四肢、趾(指)细长

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