面部危险三角区感染禁忌用热的主要原因为（）

A.热疗可促进血液循环，加重皮下出血、肿胀和疼痛

B.热疗可导致细菌入血，使炎症扩散，造成颅内感染

C.局部循环少，热疗效果差

D.局部皮肤敏感性差，容易烫伤

E.会掩盖病情贻误诊断和治疗

She is _____ the blackboard, but she can't _____ the words on it. [ ]

A. looking at, see

B. seeing, look at

C. seeing, see

D. looking at, look at