支气管舒张试验用以测定（）
A.气道通气功能的变化
B.气道气流受限的可逆性
C.气道的反应性
D.气道阻塞程度
E.细支气管的损伤程度
参考答案：B
You should understand the traffic rule by now. You've had it _____ often enough. [ ]
A. explaining
B. to explain
C. explain
D. explained
辛味药物的主要作用是（）。
A.行气、活血
B.收敛、固涩
C.补益、缓急
D.软坚、散结
E.燥湿、通泄
