能用于治疗支气管哮喘的药物是（）
A.去甲肾上腺素
B.肾上腺素
C.钙拮抗药
D.多巴酚丁胺
E.哌仑西平
参考答案：B, C
灌封中可能出现的问题是
A．药物水解
B．焦头
C．鼓泡
D．剂量不准确
E．封口不严
My parents live in a small village.
They always keep candles in the house _____ there is a power out. [ ]
A. if
B. unless
C. in case
D. so that
