下列何者可使聲門(glottis)變大？(1)環甲狀肌(cricothyroideus)(2)環杓後側肌(posterior cricoarytenoideus)(3)環杓外側肌(lateral cricoarytenoideus)(4)杓肌(arytenoideus)
(A)(1)
(B)(2)
(C)(3)
(D)(4)

環甲肌(cricothyroid)聲...