降香的功效是
A．凉血止血
B．化瘀止血
C．温经止血
D．收敛止血
参考答案：B
预防风湿热复发最常用的药物是（）
A.阿司匹林
B.强的松
C.ACTH
D.萘普生
E.青霉素类
The train hasn’t arrived yet. Could you tell me ________________?
A. when will the train arrive
B. why the train is late
C. how long should I wait
