大黄泻下的有效成分之一是
A．大黄酸B．大黄素C．大黄酚D．番泻苷AE．大黄素-8-葡萄糖苷
参考答案：D
— Do you know ______? I am going to see him.
— Sorry,I don't know. [ ]
A. where does Mr. Wang live
B. where did Mr. Wang live
C. where Mr. Wang lives
D. where Mr. Wang lived
盲巷是指长度超过（）m的不通风巷道。
A.5
B.6
C.8
