义务献血者每次的献血量为（ ）
A．50毫升
B．100毫升
C．200毫升
D．500毫升
义务献血者每次的献血量为2bb毫升；
故选：C
— Don't play in the street, children!
— .[ ]
A. Sorry, we won't.
B. Sorry, we can't.
C. Yes, we won't.
D. OK, we don't.
