脊柱后凸的好发部位是（）
A.颈段脊柱
B.胸段脊柱
C.腰段脊柱
D.骶椎
E.腰、骶段
参考答案：B
选择填空。
This is ______ sister. ______ name is Mary. [ ]
A. my, Her
B. I, She
C. my, She
D. I, Her
