板蓝根长于治疗的病证是（）
A.乳痈
B.疔毒
C.肺痈
D.肠痈
E.大头瘟毒
参考答案：E
He was about to tell me the secret ______ someone patted him on the shoulder.
A．as
B．until
C．when
D．while
极性基团的位置
