固有层与黏膜下层之间有弹力纤维分隔的是（）
A.唇红
B.颊
C.硬腭
D.软腭
E.舌背
参考答案：D
庆大霉素的潜在中毒谷浓度是
A．＞2mg/LB．＞4mg/LC．＞6mg/LD．＞8mg/LE．＞12mg/L
The restaurant is so popular here. Look, there are so many _____ here. [ ]
A. food
B. dish
C. people
D. waiter
