单项选择题

关于脊柱生理弯曲的描述，正确的是（）

A.胸椎段后凸，腰椎段前凸
B.胸椎段前凸，腰椎段后凸
C.颈椎段后凸，胸椎段前凸
D.腰椎段后凸，骶椎段前凸
E.颈、胸椎段后凸，腰、骶椎段前凸

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