唾液腺黏液囊肿好发于（）
A.下唇和颌下腺
B.舌下腺和颌下腺
C.上唇和颌下腺
D.上唇和舌下腺
E.下唇和舌尖腹侧
参考答案：E
Traditional folk arts of Tianjin like paper cutting ______ at the culture show of the 2010 Shanghai World Expo.
A．are exhibiting
B．is exhibiting
C．are being exhibited
D．is being exhibited
给特殊老人清洁口腔时应注意勿触及老人（），以免引起恶心。
A、唇部
B、牙龈
C、咽部
D、舌尖部
