题目

Although he knew _______ little about ________ large amount of work done in the field, he succeeded where more well-informed experiments failed. A . the; the B . the; a C . a; 不填 D . 不填; the 答案：D关于助听器，下列说法不正确的是A.助听器可以将声音放大，增强鼓膜的振动B.助听器可以帮助所有耳聋的人听到声音C.助听器不能帮助听觉神经受损的人听到声音D.助听器可以帮助传导系统受损的人进行骨传导