According to ______, communicative competence entails four dimensions: grammatical competence, sociolinguistic competence, discourse competence and strategic competence.

A．Richard and Rodgers

B．Halliday

C．Canale and Swain

D．Widdowson

患者男性，50岁，因右上颌肿瘤行右上颌骨部分切除术，术后应选择的绷带包扎方法是

A．弹性绷带

B．单眼交叉绷带

C．皿头带

D．三角巾

E．交叉十字绷带