临床可广泛用治各种食积及小儿疳积的药物是（）。
A.山楂
B.莱菔子
C.麦芽
D.金钱草
E.鸡内金
参考答案：E
The pilot asked all the passengers on board to remain _____ as the plane was landing. [ ]
A. seat
B. seating
C. seated
D. to be seating
头面部污染性伤口清创缝合的时限最长为（）.
A.6～8小时
B.8～12小时
C.13～20小时
D.24小时左右
E.48小时
