急性腰扭伤的不常见原因是：（）.
A.动作失调
B.姿势不良
C.搬物过重
D.重心失衡
E.准备不足
参考答案：C
They had all the children well looked after ______their parents relieved (放心)
A．making
B．being made
C．to make
D．made
叶轮切削是什么意思？
