The two girls, born four days ____in January 1986, have been friends since their junior days and both won the championship this year.

A．off

B．away

C．ahead

D．apart

急性坏死性龈口炎的临床特征是

A．牙龈红肿、牙松动、牙周流脓

B．牙龈 * * 呈刀削状缺损，疼痛出血，腐败性口臭

C．牙龈黏膜广泛小疱

D．牙龈黏膜出现乳白、微凸小点或斑块

E．牙龈黏膜白色丘疹连成线条或网状