数据：2，3，3，5，7的极差是[ ]
A．2
B．3
C．4
D．5
答案：D
器质性脊柱侧凸的原因有（）
A.先天性脊柱发育不全
B.营养不良
C.肌肉麻痹
D.慢性胸膜肥厚粘连
E.肩部及胸廓畸形
Do you know the reason ____ she has changed her mind?
A．for that
B．which
C．why
D．of which
