56. 兩鄰近細胞細胞膜間之距離為2-3nm,可提供管道以利離子及小分子物質互通之接合型態稱之為何?(A)緊密接合(tight junction)(B)中間型接合(intermediate junction)(C)間隙接合(gap junction)(D)胞橋小體(desmosome)