While we are having an exam, it is not proper to _____ our notes or dictionaries.

A．refer to

B．lead to

C．whisper to

D．react to

下列哪项不是痂下愈合的特点（）

A.伤口表面有黑褐色硬痂形成

B.愈合时间一般较无痂情况下为长

C.干燥的痂皮一般是造成细菌感染的条件

D.一般当上皮再生完成后痂皮才脱落

E.干燥的痂皮一般不利于细菌感染