与牙周炎发生关系密切的菌斑是（）

A.光滑面菌斑

B.龈上菌斑

C.颈沿菌斑

D.龈下菌斑

E.邻面菌斑

The two men who had drunk too much stood ________ at each other on the road as if they were very angry with each other.

A．staring

B．laughing

C．glaring

D．smiling