世界上鼻咽癌发病率较高的是()
A.白色人种
B.黄色人种
C.黑色人种
D.棕色人种
E.种族间无明显差异
参考答案:B
we _____ the cost of the holiday and think that we could offord it.
A.draw out
B.look out
C.carry out
D.work out
一患者缺失,戴用局部义齿后主诉有咬下唇现象,原因可能是()
A.前牙覆盖过小
B.前牙深覆拾
C.前牙覆盖过大
D.前牙开
E.患者下唇肌肉松弛