斑蝥除破血散结外，又能（） A．攻毒蚀疮 B．开窍醒神 C．收湿生肌 D．通络散结

在间接碘量法测定中，下列操作正确的是（）

A、边滴定边快速摇动

B、加入过量KI，并在室温和避免阳光直射的条件下确定

C、在70～80℃恒温条件下滴定

D、滴定一开始就加入淀粉指示剂

Do you think _______ should be allowed to drive? [ ]

A. sixteen-year-old

B. seventeen-year-olds

C. fifteen-year-old

D. eighteen-years-olds

行使交通行政处罚自由裁量权应当遵循法定、公正、公开和合理的原则；必须以事实为依据，与违法行为的事实、性质、情节以及社会危害程度相当。

We are pleased to know that you have planned to come to the Autumn Guangzhou Fair. We wish to discuss with you some other important things if you could come ______ your earliest convenience.

A．by
B．on
C．in
D．at