对荨麻疹、过敏性鼻炎等皮肤黏膜变态反应首选()
A.苯海拉明
B.肾上腺素
C.异丙肾上腺素
D.B和C
E.以上都不用
参考答案：A
—In those days, TVs were really expensive, and I couldn't .
—Neither could we. [ ]
A. afford ones
B. afford one
C. buy it
有关开瓣音正确的是（）
A.出现于心底部
B.音调低
C.开瓣音提示瓣膜弹性和活动性尚好
D.S2后0.05秒
E.历时较长而响亮
