不可能出现肢体短缩的骨折是：
A．骨折端重叠
B．骨折端嵌插
C．骨折端分离
D．骨折端塌陷
E．骨折端成角
参考答案：C
— What made her so sad at that time? She kept crying all the time.
—_______ to the ball.
A．Without being invited
B．Not be invited
C．Be not invited
D．Not having been invited
下列选项中不属于扩展基本体的是（）
A、圆环
B、切角长方体
C、切角圆柱体
D、环形波
