65.圖中箭頭所指之放射線透過性線條(radiolucent line)為下列何者在下顎上升枝的重疊影像? (A)鼻腔氣道(nasal airway) (B)鼻咽(nasopharynx) (C)口腔氣道(oral airway) (D)咽帆(velopharynx)