慢性支气管炎急性发作期最主要的治疗措施是
A．止咳祛痰
B．控制感染
C．解痉平喘
D．气雾疗法
E．吸氧补液
参考答案：B
Mr. Wood _________ us three words yesterday.[ ]
A. teaches
B. taught
C. teached
I heard him______ outside.
A．sang
B．to sing
C．singing
D．sings
