功能活血散结、止痛的药物是（）
A.麝香
B.冰片
C.两者均是
D.两者均不是
参考答案：A
毛细支气管炎最常见的病原体是（）
A.呼吸道合胞病毒
B.腺病毒
C.鼻病毒
D.肠道病毒
E.副流感病毒
History is ( ) a subject that only lets us know something in history; it also tells us a lot of truth.
A．less than
B．more than
C．no more than
D．not more than
