申请出口货物退关的，应当在退关之日起( )内向海关申请。
A．1天B．3天C．7天D．15天
参考答案：B
The whole family were worried about Jane because no one was aware ___she had gone．
A．that where
B．of the place which
C．of what
D．of where
冷水澡锻炼最好从（）时间开始。
A.春天和夏天
B.夏天和秋天
C.秋天和冬天
D.冬天和春天
