单项选择题

A.直肠温度降至37.8~38.9℃
B.直肠温度降至37.3~38.3℃
C.腋窝温度降至37.8~38.9℃
D.腋窝温度降至37.3~38.3℃
E.口腔温度降至37.8~38.9℃