声音传向内耳的主要途径是
A．外耳—鼓膜—鼓室—圆窗—内耳
B．颅骨—耳蜗内淋巴
C．外耳—鼓膜—听骨链—卵圆窗—内耳
D．外耳—鼓膜—听骨链—圆窗—内耳
E．外耳—鼓膜—听骨链—卵圆窗—圆窗—内耳