碘伏用于皮肤和手消毒常用的浓度为（）
A.0.5%
B.1.0%
C.2.0%
D.3.0%
E.5%
参考答案：A
(2012·陕西)—The trip shouldn't take more than an hour.
—________.It is at least two hours.
A．I guess so
B．That's it
C．You must be joking
D．It depends
— ____ is your birthday?
— May fourth. [ ]
A. What
B. When
C. Where
