—Oh. Mary’s not here these days. Is she ill?

—_____.Her mother told me that she was in hospital.

A．I am afraid so

B．I hope not

C．I don’t mind

D．I don’t think so

造成滞针的原因是（）

A．患者过度劳累

B．针刺时向单一方向捻转太过

C．患者体位不适而有移动改变了姿势

D．针前对针具失于检查