在任意一棵二叉树的前序序列和后序序列中，各叶子之间的相对次序关系 ( )
A．不一定相同
B．都相同
C．都不相同
D．互为逆序
参考答案：B
—How about getting a part-time job during the summer holidays?
— , but I have promised to visit my cousin in Japan.
A．No way
B．Well done
C．That sounds fine
D．No, I’m terribly sorry
远侧指间关节屈曲的正常活动度为（）
A.0°～50°
B.0°～60°
C.0°～70°
D.0°～80°
E.0°～90°
