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【单选题】
以下关于小儿各阶段身长的描述，不正确的是
A.
2岁以后平均每年增长5cm
B.
新生儿出生时平均身长约为50cm
C.
2周岁时约为85cm
D.
1岁内前半年平均每月增长1.5cm
E.
1周岁时约为75cm
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