外用杀虫止痒，内服壮阳通便的药物是（）
A.大黄
B.硫黄
C.杜仲
D.巴戟天
E.蛇床子
参考答案：B
法约尔的研究是从“办公桌前的总经理”出发的，以（）作为研究对象。
— It's raining heavily and we can't go climbing today.
— If only the weather _______ fine. [ ]
A. were
B. is
C. would be
D. had been
