巴拿马籍“海通”轮抵达口岸前未向有关边检站申报，边检站有权阻止其入境。
参考答案：对
It's the first time that he has been to Australia, ________?[ ]
A. isn't he
B. hasn't he
C. isn't it
D. hasn't it
检测周期一般以（）或（）表示。
