单项选择题
A.10%~20% B.20%~30% C.30%~40% D.40%~50% E.40%~60%
A.80% B.60% C.40% D.20% E.30%
A.切除后易复发 B.5%~15%恶变可能 C.色红或灰红,外观如乳头,颗粒或桑葚样 D.质地较息肉硬 E.质地较息肉软