正常成人每天的生理需水量为（）
A.500ml
B.1000ml
C.1500ml
D.2000ml
E.400ml
参考答案：C
进出口许可证的签发统一由海关总署负责，实行分级管理。 ( )
The search was________when night came,even though the child had not been found.[ ]
A．approved
B．acquired
C．achieved
D．abandoned
