下列有关坐骨神经痛的描述，错误的是：（）
A.病人尽量避免屈膝
B.常见于成人
C.咳嗽可诱发
D.激素治疗有效
参考答案：A
__________ of time and energy has been spent in investigating the murder.
A．A great deal
B．A good many
C．Large numbers
D．Large amounts
