______ of the coats ________ made of cotton. They feel comfortable.

A．Two-thirds; is

B．Two-thirds; are

C．Two-third; is

D．Two-third; are

颈椎张口位摄影，中心线经（）

A.上颌切牙咬合面中点

B.下颌切牙咬合面中点

C.上颌磨牙咬合面中点

D.下颌磨牙咬合面中点

E.上颌尖牙咬合面中点