题目

以下几种工具，在使用时不可能费力的是( )。 A . 剪刀 B . 理发剪 C . 螺丝钉 答案：C“Facial transplants are no longer science fiction imagination ,”a surgeon has said,____that they are ___possible but  technically complex..A．adding ,theoreticallyB．considering ,desperately C．noted ,ethicallyD．stressed , completely